Derivatives, Gains (Losses) Recognized on Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Line Items Presented in the Consolidated Statement of Income and Other Comprehensive Income [Abstract]
Loans	$ 14,618	$ 14,755	$ 43,897	$ 42,188
Other interest income	3,465	2,921	10,585	7,299
Long-term debt	(3,163)	(3,039)	(9,676)	(8,243)
Total recorded in OCI, Derivative gains (losses)	1,321	(542)	557	(850)
Derivatives (Textual) [Abstract]
Deferred net gains (losses) on derivatives in other comprehensive income			$ (359)
Maximum length of time hedged in cash flow hedge			8 years
Cash flow hedging [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax	222	206	$ 677	504
Net unrealized gains (losses) (pre-tax) recognized in OCI	1,094	(757)	(136)	(1,374)
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, before tax	1,316	(551)	541	(870)
Cash flow hedging [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax	221	204	672	498
Net unrealized gains (losses) (pre-tax) recognized in OCI	1,094	(757)	(136)	(1,374)
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, before tax	1,315	(553)	536	(876)
Cash flow hedging [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Reclassification of net (gains) losses to net income on cash flow hedges, Before tax	1	2	5	6
Net unrealized gains (losses) (pre-tax) recognized in OCI	0	0	0	0
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, before tax	1	2	5	6
Cash flow hedging [Member] \| Loans [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(131)	(69)	(343)	(190)
Cash flow hedging [Member] \| Loans [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	(131)	(69)	(343)	(190)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(131)	(69)	(343)	(190)
Cash flow hedging [Member] \| Loans [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	0	0	0	0
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	0	0	0	0
Cash flow hedging [Member] \| Other interest income [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(90)	(135)	(329)	(308)
Cash flow hedging [Member] \| Other interest income [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	(90)	(135)	(329)	(308)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(90)	(135)	(329)	(308)
Cash flow hedging [Member] \| Other interest income [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	0	0	0	0
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	0	0	0	0
Cash flow hedging [Member] \| Long-term debt [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(1)	(2)	(5)	(6)
Cash flow hedging [Member] \| Long-term debt [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	0	0	0	0
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	0	0	0	0
Cash flow hedging [Member] \| Long-term debt [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	(1)	(2)	(5)	(6)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(1)	(2)	(5)	(6)
Cash flow hedging [Member] \| Derivative gains (losses) [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(222)	(206)	(677)	(504)
Cash flow hedging [Member] \| Derivative gains (losses) [Member] \| Interest rate contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	(221)	(204)	(672)	(498)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(221)	(204)	(672)	(498)
Cash flow hedging [Member] \| Derivative gains (losses) [Member] \| Foreign exchange contracts [Member]
Gains (losses) recognized on cash flow hedging relationships [Abstract]
Realized gains (losses) (pre-tax) reclassified from OCI into net income	(1)	(2)	(5)	(6)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	$ (1)	$ (2)	$ (5)	$ (6)

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Interest and fee income generated by loans the Entity intends and has the ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (1) industrial and agricultural; (2) real estate; and (3) real estate construction loans; (4) trade financing; (5) lease financing; (6) home equity lines-of-credit; (7) automobile and other vehicle loans; and (8) credit card and other revolving-type loans. Also includes interest income for leases held by the Entity.

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Aggregate amount of interest paid or due on all long-term debt.

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Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, before tax and after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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