Income Taxes (Schedule of Unrecognized Tax Benefits and Liability for Contingent Income Taxes, Interest and Penalties) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 89	$ 72	$ 63	$ 56
Accrued interest and penalties	18	17	16
Tax credits and other indirect benefits	(7)	(9)	(12)
Liability for tax contingencies	$ 100	$ 80	$ 67