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Income Taxes (Schedule of Unresolved Income Tax Positions) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning uncertain tax positions	$ 472	$ 528
Increases related to current year income tax positions	12	62
Increases related to prior year income tax positions	5	5
Settlements and resolutions of income tax audits	(41)	(78)
Statute of limitations expirations and other	(7)	(40)
Foreign currency translation	16
Foreign currency translation		(5)
Ending uncertain tax positions	$ 457	$ 472

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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 settlements with taxing authorities.

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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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