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Basis of Presentation - Organization, Consolidation and Presentation of Financial statement (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Service management costs $ 41   $ 40 $ 125 $ 127
Income taxes $ 1 $ (25) $ (154) (54) $ (237)
Correction to increase income tax benefit due to misstatement       $ 6