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Derivative instruments - Hedged Items in Fair Value Hedging Relationships (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivative [Line Items] |  |
Available-for-sale securities included in closed portfolios, subject to portfolio layer method, increase (decrease) | $ 64 | $ (92)
Fair value hedging | Securities – Available-for-sale |  |
Derivative [Line Items] |  |
Carrying amount of hedged asset or liability, Available-for-sale securities | 41,777 | 40,751
Hedge accounting basis adjustment increase (decrease), Available-for-sale securities | (801) | (1,650)
Hedge accounting basis adjustment increase (decrease), discontinued hedges | (363) | (474)
Available-for-sale securities included in closed portfolios, subject to portfolio layer method | 14,300 | 12,100
Available-for-sale securities included in closed portfolios, subject to portfolio layer method, increase (decrease) | 64 | (92)
Fair value hedging | Securities – Available-for-sale | Designated as hedging |  |
Derivative [Line Items] |  |
Available-for-sale securities included in closed portfolios, subject to portfolio layer method | 6,800 | 6,200
Fair value hedging | Loans |  |
Derivative [Line Items] |  |
Carrying amount of hedged asset or liability, Available-for-sale securities | 3,012 | 3,162
Hedge accounting basis adjustment increase (decrease), Available-for-sale securities | 4 | (7)
Available-for-sale securities included in closed portfolios, subject to portfolio layer method | 3,000 | 3,200
Fair value hedging | Loans | Designated as hedging |  |
Derivative [Line Items] |  |
Available-for-sale securities included in closed portfolios, subject to portfolio layer method | 1,400 | 1,400
Fair value hedging | Long-term debt |  |
Derivative [Line Items] |  |
Carrying amount of hedged asset or liability, Long-term debt | 29,497 | 27,458
Hedge accounting basis adjustment increase (decrease), Long-term debt | (246) | (1,042)
Hedged liability, discontinued fair value hedge, cumulative increase (decrease) | $ 7 | $ (5)

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