Accounts Receivable, Net (Allowance for Credit Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Allowance for expected credit losses	$ 475	$ 546	$ 254
Current period provision for expected credit losses, net of recoveries(1)	(47)	277
Write-offs charged against the allowance for expected credit losses	(18)	(5)
Other, net(2)	$ (6)	20
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accounts Notes And Loans Receivable [Line Items]
Other, net(2)		34
COVID 19 [Member]
Accounts Notes And Loans Receivable [Line Items]
Current period provision for expected credit losses, net of recoveries(1)		$ 248