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Income Taxes (Schedule of Unrecognized Tax Benefits and Consolidated Liability for Tax Contingencies) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Unrecognized tax benefits $ 74 $ 64 $ 85 $ 66
Accrued interest and penalties 15 11    
Tax credits and other indirect benefits (1) (1)    
Liability for tax contingencies $ 88 $ 74