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Income Taxes (Schedule of Income Tax Provision and Effective Tax Rate) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]        
Deferred tax benefit (provision) $ (3) $ (72) $ 8 $ (127)
Effective tax rate (26.00%) 24.00% 10.00% 24.00%
Current Income Tax Expense (Benefit) $ (1) $ 0 $ 10 $ 0