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Income Taxes - Net Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Beginning balance $ 220 $ 211
Additions based on tax positions related to the current year 3 11
Additions for tax positions of prior years 46 48
Reductions for tax positions of prior years (58) (50)
Statute of limitations (6) (1)
Settlements (6) 0
Interest and penalties (1) 1
Ending balance 198 220
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 163 188
Unrecognized tax benefits that would not impact the effective tax rate $ 35 $ 32