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Income Taxes - Net Unrecognized Tax Benefits (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]    
Beginning balance $ 198 $ 220
Additions based on tax positions related to the current year 7 3
Additions for tax positions of prior years 6 46
Reductions for tax positions of prior years (11) (58)
Statute of limitations (1) (6)
Settlements (67) (6)
Interest and penalties (4) (1)
Ending balance 128 198
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 104 163
Unrecognized tax benefits that would not impact the effective tax rate $ 24 $ 35