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Income Taxes (Unrecognized Income Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at January 1	$ 383	$ 298	$ 354
Gross increases for tax positions of prior years	144	36	75
Gross decreases for tax positions of prior years	(34)	(13)	(86)
Gross increases for tax positions of the current year	36	87	41
Settlements	(22)	(13)	(70)
Other	(10)	(12)	(16)
Balance at December 31	$ 497	$ 383	$ 298

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- Definition

Unrecognized Tax Benefits, Other

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- Definition

Amount of unrecognized tax benefits.

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-SubTopic 10
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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 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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