Derivative Financial Instruments And Hedging Activities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Average maturity of foreign currency forward contracts, in years	2 years
Cash and equivalents	$ 1,603,000,000	$ 2,824,000,000
Marketable securities held in trust	191,000,000	211,000,000
Derivative notional amount	$ 6,800,000,000	$ 9,400,000,000
Maximum
Derivative Instruments, Gain (Loss) [Line Items]
Maturity of fixed-income securities, in years	5 years