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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income $ 3,275 $ 3,037 $ 2,834 $ 2,479 $ 2,266 $ 2,128
Foreign currency translation adjustment            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 70   87      
Net unrealized gains on investments, net of tax            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income 0   7      
Accumulated other comprehensive income            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated other comprehensive income $ 70 $ 56 $ 94 $ 30 $ (15) $ 25