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Contracts Accounted for as Credit Derivatives - Distribution of Credit Derivative Net Par Outstanding by Internal Rating (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Credit Derivatives    
Net Par Outstanding $ 3,262 $ 3,203
BIG    
Credit Derivatives    
Net Par Outstanding 56 57
Credit Concentration Risk | Derivative, Aggregate Notional Amount    
Credit Derivatives    
Net Par Outstanding $ 3,262 $ 3,203
Percentage of installment premiums denominated in currencies other than the U.S. dollar 100.00% 100.00%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | AAA    
Credit Derivatives    
Net Par Outstanding $ 1,283 $ 1,260
Percentage of installment premiums denominated in currencies other than the U.S. dollar 39.30% 39.30%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | AA    
Credit Derivatives    
Net Par Outstanding $ 1,071 $ 1,064
Percentage of installment premiums denominated in currencies other than the U.S. dollar 32.80% 33.20%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | A    
Credit Derivatives    
Net Par Outstanding $ 254 $ 232
Percentage of installment premiums denominated in currencies other than the U.S. dollar 7.80% 7.20%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | BBB    
Credit Derivatives    
Net Par Outstanding $ 598 $ 590
Percentage of installment premiums denominated in currencies other than the U.S. dollar 18.40% 18.50%
Credit Concentration Risk | Derivative, Aggregate Notional Amount | BIG    
Credit Derivatives    
Net Par Outstanding $ 56 $ 57
Percentage of installment premiums denominated in currencies other than the U.S. dollar 1.70% 1.80%