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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Increase in income tax expense | $ 996 |  | $ 1,980 |
Income tax expense | $ 1,483 | $ 487 | $ 2,897 | $ 917
Effective tax rates | 30.00% | 25.00% | 29.00% | 18.00%

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