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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 Disclosure [Abstract]          
Effective income tax rate 32.30% 32.60% 31.90% 32.40%  
Unrecognized tax benefits $ 122   $ 122   $ 120
Accrued interest and penalties associated with uncertain tax positions $ 37   $ 37   $ 31