Income Tax (Reconciliation of the Amount of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized Tax Benefits Beginning balance, January 1	$ 342	$ 333	$ 325
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions	2	281	264
Unrecognized Tax Benefits, Decreases Resulting from Prior Period Tax Positions	(312)	(278)	(262)
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	2	6	6
Unrecognized Tax Benefits Ending balance, December 31	$ 34	$ 342	$ 333