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Share-Based Payment and Other Benefits Schedule of Additional Share-Based Payment Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense: Options, RSUs and PSUs $ 148 $ 122 $ 111
Income tax benefit recognized for equity awards 49 41 37
Income tax benefit related to options exercised 31 19 20
Total intrinsic value of stock options exercised $ 86 $ 57 $ 60
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value of awards granted $ 91 $ 88 $ 76
Total intrinsic value of units converted into shares of Class A common stock $ 122 $ 135 $ 173
Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value of awards granted $ 92 $ 99 $ 78
Total intrinsic value of units converted into shares of Class A common stock $ 25 $ 24 $ 28