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Derivative Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Amortized cost of the hedged assets | $ 648 | $ 484
Amortized cost of the hedged liabilities | (693) | (676)
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets | 25 | 7
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets (liabilities) | 182 | 199
Discontinued Hedges |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets (liabilities) | $ (302) | $ (310)

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