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Derivative Instruments - Call Options By Counterparty and Credit Rating (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value $ 1,610 $ 227
Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 1,610 227
Bank of America | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 162 24
Barclays | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 76 24
Canadian Imperial Bank of Commerce | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 61 0
Citibank, N.A. | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 46 0
Credit Suisse | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 6 16
Goldman Sachs | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 17 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 149 12
Mizuho | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 393 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 132 0
Societe Generale | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 82 0
Truist | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 119 59
UBS AG | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value 50 0
Wells Fargo | Call Options And Interest Rate Swaps    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Fair Value $ 195 $ 35