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Stockholders' Equity - Fair Value of Awards Granted and Vested (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total granted $ 65 $ 51
Total vested 22 20
RSAs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total granted 42 32
Total vested 21 18
PSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total granted 23 19
Total vested $ 1 $ 2