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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	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. statutory rate at 21%			$ 194	$ 166	$ 155
Tax on foreign income			30	7	30
U.S. taxes on foreign income, net of credits			14	15	24
Valuation allowance changes			(11)	(33)	(1)
Tax contingencies		$ 15	1	19	(2)
Tax law changes			4	(11)	4
Other items, net			12	3	6
Total	$ 37		$ 244	$ 166	$ 216

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- Definition

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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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