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Derivatives and Hedging Activities - Schedule of Cumulative Basis Adjustments on Fair Value Hedges (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair Value | $ 38,459 | $ 39,596
Location, Statement of Financial Position, Balance [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest | Interest rate |  |
Derivatives, Fair Value [Line Items] |  |
Carrying amount of hedged item | 12,830 | 12,843
Fair Value | 8,100 | 6,700
Hedged layer amount | 5,800 | 4,900
Hedged asset, fair value hedge, portfolio layer method, hedged layer, fair value, cumulative increase (decrease) | 46 | (35)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest | Interest rate | Hedge accounting basis adjustment - active hedges |  |
Derivatives, Fair Value [Line Items] |  |
Hedge accounting basis adjustment | 25 | (100)
Hedged asset, fair value hedge, portfolio layer method, hedged layer, fair value, cumulative increase (decrease) | 32 | (50)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:DebtSecuritiesAvailableForSaleExcludingAccruedInterest | Interest rate | Hedge accounting basis adjustment - discontinued hedges |  |
Derivatives, Fair Value [Line Items] |  |
Hedge accounting basis adjustment | 14 | 14
Hedged asset, fair value hedge, portfolio layer method, hedged layer, fair value, cumulative increase (decrease) | 14 | 14
Location, Statement of Financial Position, Balance [Axis]: us-gaap:LongTermDebt | Interest rate |  |
Derivatives, Fair Value [Line Items] |  |
Carrying amount of hedged item | 8,609 | 8,504
Location, Statement of Financial Position, Balance [Axis]: us-gaap:LongTermDebt | Interest rate | Hedge accounting basis adjustment - active hedges |  |
Derivatives, Fair Value [Line Items] |  |
Hedge accounting basis adjustment | (292) | (199)
Location, Statement of Financial Position, Balance [Axis]: us-gaap:LongTermDebt | Interest rate | Hedge accounting basis adjustment - discontinued hedges |  |
Derivatives, Fair Value [Line Items] |  |
Hedge accounting basis adjustment | $ (3) | $ (3)

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