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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Tax Disclosure [Abstract]        
Income tax (benefit) expense $ 128 $ 8 $ (52) $ 14
Income (loss) from continuing operations before income tax benefit (expense) $ 992 $ (565) $ (1,494) $ (1,223)
Effective income tax rate 12.90% (1.40%) 3.50% (1.10%)
Statutory federal income tax rate 21.00% 21.00% 21.00% 21.00%