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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense (benefit) | $ 1,328 | $ (2,320) | $ 2,107 | $ (1,756)
Decrease in income before income tax expense | 15,020 |  | 13,050 |
Income (loss) before income tax expense | $ 4,422 | $ (10,597) | $ 6,599 | $ (6,452)
Effective tax rates | 30.00% | 22.00% | 32.00% | 27.00%

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