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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Unrecognized Tax Benefits, Interest on Income Taxes Expense $ (1) $ (2) $ (2)
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 7 6  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance 352 364 384
Additions for current year tax positions 0 2 2
Additions for tax positions of prior years 2 1 12
Reductions for tax positions of prior years (5) (1) (7)
Effects of foreign currency translation 0 0 (3)
Settlements 0 (13) (17)
Lapse of statute of limitations (1) (1) (7)
Ending balance 348 352 364
Unrecognized Tax Benefits, Income Tax Penalties Accrued 0 0  
Unrecognized Tax Benefits, Income Tax Penalties Expense $ 0 $ 0 $ 0