Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (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 – January 1	$ 966	$ 1,476	$ 2,412
Gross increases – tax positions in prior periods	64	44	100
Gross decreases – tax positions in prior periods	(245)	(581)	(1,418)
Gross increases – current period tax positions	73	136	344
Settlements		109	39
Unrecognized tax benefits – December 31	$ 858	$ 966	1,476
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions			$ (1)