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Investments - Summary of Debt Securities with a Decline in Fair Value (Details)
$ in Millions
Dec. 31, 2021
USD ($)
position
Dec. 31, 2020
USD ($)
position
More than one year    
Total Fair Value $ 3,890  
Total Amortized Cost 4,021  
Total Unrealized Depreciation $ (131)  
Total Number of Issues | position 1,886  
Fair Value   $ 1,515
Amortized Cost   1,568
Unrealized Depreciation   $ (53)
Number of Issues | position   571
Investment grade    
One year or less    
Fair Value   $ 1,026
Amortized Cost   1,045
Unrealized Depreciation   $ (19)
Number of Issues | position   300
More than one year    
Fair Value   $ 18
Amortized Cost   18
Unrealized Depreciation   $ 0
Number of Issues | position   6
Investment grade | Debt securities    
One year or less    
Fair Value $ 2,785  
Amortized Cost 2,861  
Unrealized Depreciation $ (76)  
Number of Issues | position 909  
More than one year    
Fair Value $ 382  
Amortized Cost 412  
Unrealized Depreciation $ (30)  
Number of Issues | position 143  
Below investment grade    
One year or less    
Fair Value   $ 381
Amortized Cost   405
Unrealized Depreciation   $ (24)
Number of Issues | position   232
More than one year    
Fair Value   $ 90
Amortized Cost   100
Unrealized Depreciation   $ (10)
Number of Issues | position   33
Below investment grade | Debt securities    
One year or less    
Fair Value $ 561  
Amortized Cost 578  
Unrealized Depreciation $ (17)  
Number of Issues | position 781  
More than one year    
Fair Value $ 162  
Amortized Cost 170  
Unrealized Depreciation $ (8)  
Number of Issues | position 53