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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 1,328	$ (2,320)	$ 2,107	$ (1,756)
Decrease in income before income tax expense	15,020		13,050
Income (loss) before income tax expense	$ 4,422	$ (10,597)	$ 6,599	$ (6,452)
Effective tax rates	30.00%	22.00%	32.00%	27.00%

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Increase (Decrease) in Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest

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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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