Derivatives, Gains (Losses) Recognized on Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Line Items Presented in the Consolidated Statement of Income and Other Comprehensive Income [Abstract]
Loans	$ 14,713	$ 13,318
Other interest income	3,601	1,988
Long-term debt	(3,349)	(2,511)
Total recorded in OCI, Derivative gains (losses)	(660)	503
Derivatives (Textual) [Abstract]
Deferred net gains (losses) on derivatives in other comprehensive income	$ (797)
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	$ 244	113
Net unrealized gains (losses) (pre-tax) recognized in OCI	(908)	384
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, before tax	(664)	497
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	242	111
Net unrealized gains (losses) (pre-tax) recognized in OCI	(907)	383
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, before tax	(665)	494
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	2	2
Net unrealized gains (losses) (pre-tax) recognized in OCI	(1)	1
Other comprehensive income (loss), cash flow hedge, gain (loss), after reclassification, before tax	1	3
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	(97)	(53)
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	(97)	(53)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(97)	(53)
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
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	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	(145)	(58)
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	(145)	(58)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(145)	(58)
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
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	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	(2)	(2)
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
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	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	(2)	(2)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(2)	(2)
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	(244)	(113)
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	(242)	(111)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	(242)	(111)
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	(2)	(2)
Total gain (loss) (pre-tax) on cash flow hedges recognized in earnings	$ (2)	$ (2)

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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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 after reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge and fair value hedge included in assessment of hedge effectiveness and increase (decrease) in value of excluded component of derivative designated and qualifying as hedge.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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