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Internal documents show that the social network gave Microsoft, Amazon, Spotify and others far greater access to people’s data than it has disclosed.

For years, Facebook gave some of the world’s largest technology companies more intrusive access to users’ personal data than it has disclosed, effectively exempting those business partners from its usual privacy rules, according to internal records and interviews.

The special arrangements are detailed in hundreds of pages of Facebook documents obtained by The New York Times. The records, generated in 2017 by the company’s internal system for tracking partnerships, provide the most complete picture yet of the social network’s data-sharing practices. They also underscore how personal data has become the most prized commodity of the digital age, traded on a vast scale by some of the most powerful companies in Silicon Valley and beyond.

Facebook allowed Microsoft’s Bing search engine to see the names of virtually all Facebook users’ friends without consent, the records show, and gave Netflix and Spotify the ability to read Facebook users’ private messages.

The social network permitted Amazon to obtain users’ names and contact information through their friends, and it let Yahoo view streams of friends’ posts as recently as this summer, despite public statements that it had stopped that type of sharing years earlier.

Facebook has been reeling from a series of privacy scandals, set off by revelations in March that a political consulting firm, Cambridge Analytica, improperly used Facebook data to build tools that aided President Trump’s 2016 campaign. Acknowledging that it had breached users’ trust, Facebook insisted that it had instituted stricter privacy protections long ago. Mark Zuckerberg, the chief executive, assured lawmakers in April that people “have complete control” over everything they share on Facebook.

[Facebook’s strategy in times of crisis: delay, deny and deflect.]

Facebook began forming data partnerships when it was still a relatively young company. Mr. Zuckerberg was determined to weave Facebook’s services into other sites and platforms, believing it would stave off obsolescence and insulate Facebook from competition. Every corporate partner that integrated Facebook data into its online products helped drive the platform’s expansion, bringing in new users, spurring them to spend more time on Facebook and driving up advertising revenue. At the same time, Facebook got critical data back from its partners.

The partnerships were so important that decisions about forming them were vetted at high levels, sometimes by Mr. Zuckerberg and Sheryl Sandberg, the chief operating officer, Facebook officials said. While many of the partnerships were announced publicly, the details of the sharing arrangements typically were confidential.

Facebook also allowed Spotify, Netflix and the Royal Bank of Canada to read, write and delete users’ private messages, and to see all participants on a thread — privileges that appeared to go beyond what the companies needed to integrate Facebook into their systems, the records show. Facebook acknowledged that it did not consider any of those three companies to be service providers. Spokespeople for Spotify and Netflix said those companies were unaware of the broad powers Facebook had granted them. A spokesman for Netflix said Wednesday that it had used the access only to enable customers to recommend TV shows and movies to their friends.

A Royal Bank of Canada spokesman disputed that the bank had had any such access. (Aspects of some sharing partnerships, including those with the Royal Bank of Canada and Bing, were first reported by The Wall Street Journal.)

Spotify, which could view messages of more than 70 million users a month, still offers the option to share music through Facebook Messenger. But Netflix and the Canadian bank no longer needed access to messages because they had deactivated features that incorporated it.

These were not the only companies that had special access longer than they needed it. Yahoo, The Times and others could still get Facebook users’ personal information in 2017.

Yahoo could view real-time feeds of friends’ posts for a feature that the company had ended in 2012. A Yahoo spokesman declined to discuss the partnership in detail but said the company did not use the information for advertising. The Times — one of nine media companies named in the documents — had access to users’ friend lists for an article-sharing application it had discontinued in 2011. A spokeswoman for the news organization said it was not obtaining any data.

Facebook’s internal records also revealed more about the extent of sharing deals with over 60 makers of smartphones, tablets and other devices, agreements first reported by The Times in June.

Facebook empowered Apple to hide from Facebook users all indicators that its devices were asking for data. Apple devices also had access to the contact numbers and calendar entries of people who had changed their account settings to disable all sharing, the records show.

Apple officials said they were not aware that Facebook had granted its devices any special access. They added that any shared data remained on the devices and was not available to anyone other than the users.