Assets and Liabilities Held for Sale - Summary of Information (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets held for sale
Total assets held for sale	$ 0	$ 517
Liabilities held for sale
Total liabilities held for sale	$ 0	100
Not Discontinued Operations \| Sale of ATG [Member]
Assets held for sale
Cash and cash equivalents		349
Prepaid expenses and other current assets		2
Investments		2
Operating lease right-of-use assets		26
Property and equipment, net		78
Intangibles		31
Goodwill		29
Total assets held for sale		517
Liabilities held for sale
Accounts payable		8
Accrued and other current liabilities		66
Operating lease liabilities, current		6
Operating lease liabilities, non-current		20
Total liabilities held for sale		100
Net assets held for sale		$ 417

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