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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Income tax expense $ 213 $ 189 $ 367 $ 413  
Effective tax rate 36.20% 35.60% 34.80% 35.20%  
Federal statutory income tax rate 35.00% 35.00% 35.00% 35.00%  
Unrecognized Tax Benefits $ 144   $ 144   $ 173
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations     $ 29