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Derivative Instruments - Call Options By Counterparty and Credit Rating (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value $ 1,900 $ 227
Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 1,887 227
Bank of America | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 207 24
Barclays | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 67 24
Canadian Imperial Bank of Commerce | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 54 0
Citibank, N.A. | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 62 0
Credit Suisse | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 0 16
Goldman Sachs | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 29 0
ING | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 6 10
J.P. Morgan | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 254 12
Mizuho | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 388 0
Morgan Stanley | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 114 43
NATIXIS | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 2 4
Royal Bank of Canada | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 137 0
Societe Generale | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 154 0
Truist | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 115 59
UBS AG | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 67 0
Wells Fargo | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value $ 231 $ 35