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Derivative instruments - Hedged Items in Fair Value Hedging Relationships (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
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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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. Excludes cumulative basis adjustment related to foreign exchange risk.

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