Income Taxes (Schedule of Reconciliation of Unrecognized Tax Benefits Included in Uncertain Tax Positions) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Activity Related To Uncertain Tax Positions [Roll Forward]
As of the beginning of the year		$ 165	$ 134	$ 162
Increases in tax positions for the current year		33	18	1
Increases in tax positions for prior years(1)	[1]	28	26	37
Decreases in tax positions for prior years		(11)	(13)	(41)
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities		3
Increases (decreases) due to settlements			0	(25)
As of the end of the year		218	165	134
Total uncertain tax positions that if recognized would impact the effective tax rate		224	182	132
Total amount of interest expense (benefit) and penalties recognized in the consolidated statements of operations(2)	[2]	2	6	5
Total amount of interest expense and penalties recognized in the consolidated balance sheets		52	54	45
Uncertain tax positions		$ 218	$ 165	$ 134

[1] Includes the impact on uncertain tax positions for the year ended December 31, 2019 due to the closure of federal income tax audits for the years 2009 through 2012.

[2] This amount reflects interest on uncertain tax positions and release of tax positions due to changes in assessment, statute lapses, or audit closures that were reflected in the consolidated statements of operations.