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Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory income tax rate (as a percent)	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. statutory rate at 21%, 35% and 35%	$ 155	$ 290	$ 269
Tax on foreign income	30	(126)	(119)
U.S. taxes on foreign income, net of credits	24	45	31
Valuation allowance changes	(1)	9	(14)
Tax contingencies	(2)	6	11
Tax law changes	4	174	3
Other items, net	6	3	5
Total	$ 216	$ 401	$ 186

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Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Net Of Tax Credits, Amount

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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