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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Income Tax Disclosure [Abstract]      
Excess tax benefits recognized $ 8   $ 26
Tax benefit from foreign Supreme Court decision   $ 13  
Tax benefit from prior year tax positions currently being challenged $ 15   $ 15