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Derivative Financial Instruments - OTC derivatives counterparty credit exposure by counterparty credit rating (Details)
$ in Millions
Jun. 30, 2022
USD ($)
counter-party
Dec. 31, 2021
USD ($)
counter-party
Credit Derivatives    
Number of counter- parties | counter-party 4 2
Notional amount $ 732 $ 566
Credit exposure 48 16
Exposure, net of collateral $ 0 $ 0
A+    
Credit Derivatives    
Number of counter- parties | counter-party 3 1
Notional amount $ 436 $ 199
Credit exposure 28 7
Exposure, net of collateral $ 0 $ 0
A    
Credit Derivatives    
Number of counter- parties | counter-party 1 1
Notional amount $ 296 $ 367
Credit exposure 20 9
Exposure, net of collateral $ 0 $ 0