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Income Taxes (Reconciliation of Beginning and Ending Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits
Balance at beginning of year	$ 85	$ 66	$ 169
Additions based on tax positions related to the current year	0	0	0
Additions for tax positions of prior years	32	22	129
Reductions for tax positions due to lapse of statutes of limitations	0	0	(4)
Reductions for tax positions of prior years	(16)	(1)	(208)
Tax settlements	(37)	(2)	(20)
Balance at end of year	$ 64	$ 85	$ 66

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- Definition

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

+ References

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Amount of unrecognized tax benefits.

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