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Income Taxes Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in Unrecognized Tax Benefits [Abstract]
Balance at beginning of year	$ 609	$ 615	$ 610
Additions attributable to tax positions taken in the current year	8	0	8
Additions attributable to tax positions taken in prior years	7	28	18
Reduction attributable to tax positions taken in prior years	0	(25)	(20)
Lapse of statute	0	9	1
Balance at end of year	$ 624	$ 609	$ 615

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- Definition

Changes in Unrecognized Tax Benefits [Abstract]

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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 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 increase 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 lapses of applicable statutes of limitations.

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