Provision For Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Provision for income taxes	$ (12)	$ (10)	$ (33)	$ (26)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	49	$ 58	$ 137	133
Effective Income Tax Rate Reconciliation, Percent			21.00%		35.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount			$ 4	4
Unrecognized Tax Benefits	$ 18		18		$ 18
Jurisdictions where valuation allowances are maintained [Member]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest			$ (8)	$ (9)

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

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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