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Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	21.00%	35.00%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. statutory rate at 21%, 21% and 35%				$ 166	$ 155	$ 290
Tax on foreign income				7	30	(126)
U.S. taxes on foreign income, net of credits				15	24	45
Valuation allowance changes				(33)	(1)	9
Tax contingencies				19	(2)	6
Tax law changes				(11)	4	174
Other items, net				3	6	3
Total	$ 37	$ 15	$ 28	$ 166	$ 216	$ 401

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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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