Income Taxes (Schedule of Unrecognized Tax Benefits and Consolidated Liability for Tax Contingencies) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 53	$ 74	$ 64	$ 85
Accrued interest and penalties	11	15
Tax credits and other indirect benefits	0	(1)
Liability for tax contingencies	$ 64	$ 88