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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Decrease in income tax expense | $ 174 |  | $ 111 |
Income tax expense | $ 1,469 | $ 1,643 | $ 4,429 | $ 4,540
Effective tax rates | 36.00% | 29.00% | 32.00% | 29.00%
Cash repatriation | $ 430 |  |  |
Income before income tax expense | $ 4,049 | $ 5,699 | $ 13,941 | $ 15,677

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