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Income Taxes (Income (Loss) from Continuing Operations before Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Domestic $ 850 $ 618 $ 372
Foreign [1] 31 23 20
Income (loss) before income taxes $ 881 $ 641 $ 392
[1]
Inclusive of income (loss) before income taxes from Puerto Rico.