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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of period	$ 775	$ 1,341	$ 1,557
Additions to current year tax positions	435	18	292
Additions to prior years' tax positions	26	13	264
Reductions to prior years' tax positions	(132)	(501)	(244)
Reductions in tax positions due to lapse of statutory limitations	(3)	(8)	(38)
Settlements	(10)	(93)	(450)
Other	(5)	5	(40)
Balance at end of period	1,086	775	$ 1,341
Unrecognized tax benefit that would favorably affect effective tax rate	851	539
Income tax related interest and penalties accrual	$ 92	$ 117

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This element represents a sum total of additions or reductions to reserves not separately reflected in the tabular roll for the period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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