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Provision For Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Provision for income taxes $ (21) $ (16)  
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest $ 88 75  
Effective Income Tax Rate Reconciliation, Percent 21.00%   35.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount $ 3 2  
Jurisdictions where valuation allowances are maintained [Member]      
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest $ (3) $ (3)