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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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Decrease in Income Tax Expense

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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