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Share-Based Payments Schedule of Additional Share-Based Payment Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense: Options, RSUs and PSUs $ 254 $ 250 $ 196
Income tax benefit recognized for equity awards 53 53 41
Share-based Payment Arrangement, Exercise of Option, Tax Benefit 68 69 53
Total intrinsic value of stock options exercised $ 317 $ 317 $ 242
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value of awards granted $ 288 $ 226 $ 171
Total intrinsic value of units converted into shares of Class A common stock $ 330 $ 394 $ 194
Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value of awards granted $ 291 $ 231 $ 226
Total intrinsic value of units converted into shares of Class A common stock $ 92 $ 85 $ 40