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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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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.

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