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Provision (Benefit) for Income Taxes Reconciliation of Unrecognized Tax Benefits Table (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at beginning of period $ 55 $ 89
Additions for tax positions of prior years 0 2
Reductions for tax positions of prior years (4) 0
Changes due to currency translation (1) (36)
Balance at end of period $ 50 $ 55