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Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, January 1	$ 278	$ 219	$ 102
Additions for tax positions of the current year	20	21	25
Additions for tax positions of prior years	138	60	110
Reductions for tax positions of prior years	(26)	(5)	(1)
Settlements during the period	(4)	(8)	(10)
Lapses of applicable statute of limitation	(12)	(9)	(7)
Balance, December 31	$ 394	$ 278	$ 219

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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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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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