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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Income Tax Disclosure [Abstract] |  |
Income tax (benefit) expense | $ 17 | $ (180)
Income (loss) from continuing operations before income tax benefit (expense) | $ 616 | $ (2,486)
Effective income tax rate | 2.80% | 7.20%
Statutory federal income tax rate | 21.00% | 21.00%

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