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Derivative Instruments - Schedule of Collateral Amounts With Rights to Reclaim or Obligation to Return Cash (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Credit Derivatives [Line Items] |  |
Collateral Posted by Counterparty | $ 4,987 | $ 7,182
Collateral Posted to Counterparty | (42) | (110)
AA- |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counterparty | 2,394 | 4,043
Collateral Posted to Counterparty | (11) | (21)
A+ |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counterparty | 1,978 | 2,460
Collateral Posted to Counterparty | (31) | (89)
A |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counterparty | 57 | 47
Collateral Posted to Counterparty | 0 | 0
A- |  |
Credit Derivatives [Line Items] |  |
Collateral Posted by Counterparty | 558 | 632
Collateral Posted to Counterparty | $ 0 | $ 0

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