Supplementary Information for Certain Balance Sheet Accounts - Deferred Revenue and Accrued Expenses (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts payable, accrued liabilities and deferred income	$ 926	$ 898
Accrued discretionary and incentive compensation	262	811
Accrued vacation	167	145
Other employee-related liabilities	43	72
Total deferred revenue and accrued expenses	$ 1,398	$ 1,926