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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Decrease in income tax expense | $ 162 |  | $ 63 |
Income tax expense | 1,645 | $ 1,483 | 2,960 | $ 2,897
Income before income tax expense | $ 5,935 | $ 4,905 | $ 9,892 | $ 9,978
Effective tax rates | 28.00% | 30.00% | 30.00% | 29.00%

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