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Other assets - Tax Credit Investments (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Other Assets [Abstract]
Tax credit investments	$ 2,888			$ 2,888		$ 2,821
Tax credit investments, commitment	897			897		$ 951
Tax credit investments, commitment - remainder of 2025	271			271
Tax credit investments, commitment - 2026	128			128
Tax credit investments, commitment - 2027	128			128
Tax credit investments, commitment - 2028	89			89
Tax credit investments, commitment - 2029	79			79
Tax credit investments, commitment - 2030 and thereafter	202			202
Tax credits and other tax benefits	140	$ 134	$ 114	416	$ 342
Amortization expense included in the provision for income taxes	$ 112	$ 115	$ 92	$ 353	$ 276

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