Derivatives, Gains (Losses) Recognized on Fair Value 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]
Debt securities	$ 4,630	$ 4,178	$ 13,362	$ 11,998
Deposits	(6,445)	(4,608)	(18,405)	(11,174)
Long-term debt	(3,163)	(3,039)	(9,676)	(8,243)
Net gains (losses) from trading and securities	1,248	1,246	4,217	3,263
Other	596	381	1,925	1,373
Total recorded in OCI, Derivative gains (losses)	1,321	(542)	557	(850)
Fair value hedging [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives, Total recorded in OCI	5	9	16	20
Fair value hedging [Member] \| Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives, Total recorded in OCI	0	0	0	0
Fair value hedging [Member] \| Foreign exchange contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives, Total recorded in OCI	5	9	16	20
Fair value hedging [Member] \| Commodity contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives, Total recorded in OCI	0	0	0	0
Fair value hedging [Member] \| Debt securities [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Total gains (losses) (pre-tax) on interest rate contracts	227	272	754	864
Fair value hedging [Member] \| Debt securities [Member] \| Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	234	263	756	863
Recognized on derivatives	(1,115)	668	(541)	905
Recognized on hedged items	1,108	(659)	539	(904)
Total gains (losses) (pre-tax) on interest rate contracts	227	272	754	864
Fair value hedging [Member] \| Debt securities [Member] \| Foreign exchange contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	0	0	0	0
Recognized on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0	0	0
Fair value hedging [Member] \| Debt securities [Member] \| Commodity contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0	0	0
Fair value hedging [Member] \| Deposits [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Total gains (losses) (pre-tax) on interest rate contracts	(124)	(98)	(387)	(211)
Fair value hedging [Member] \| Deposits [Member] \| Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	(123)	(114)	(384)	(226)
Recognized on derivatives	565	5	247	(166)
Recognized on hedged items	(566)	11	(250)	181
Total gains (losses) (pre-tax) on interest rate contracts	(124)	(98)	(387)	(211)
Fair value hedging [Member] \| Deposits [Member] \| Foreign exchange contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	0	0	0	0
Recognized on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0	0	0
Fair value hedging [Member] \| Deposits [Member] \| Commodity contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0	0	0
Fair value hedging [Member] \| Long-term debt [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Total gains (losses) (pre-tax) on interest rate contracts	(1,062)	(994)	(3,143)	(2,703)
Fair value hedging [Member] \| Long-term debt [Member] \| Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	(1,014)	(956)	(3,007)	(2,488)
Recognized on derivatives	5,177	(3,970)	2,363	(4,199)
Recognized on hedged items	(5,185)	3,973	(2,395)	4,188
Total gains (losses) (pre-tax) on interest rate contracts	(1,022)	(953)	(3,039)	(2,499)
Fair value hedging [Member] \| Long-term debt [Member] \| Foreign exchange contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	(34)	(38)	(92)	(189)
Recognized on derivatives	30	(10)	18	24
Recognized on hedged items	(36)	7	(30)	(39)
Total gains (losses) (pre-tax) on interest rate contracts	(40)	(41)	(104)	(204)
Fair value hedging [Member] \| Long-term debt [Member] \| Commodity contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0	0	0
Fair value hedging [Member] \| Net gains from trading and securities [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Total gains (losses) (pre-tax) on interest rate contracts	0	0	2	0
Fair value hedging [Member] \| Net gains from trading and securities [Member] \| Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	0	0	0	0
Recognized on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0	0	0
Fair value hedging [Member] \| Net gains from trading and securities [Member] \| Foreign exchange contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	0	0	0	0
Recognized on derivatives	76	0	(4)	0
Recognized on hedged items	(76)	0	6	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0	2	0
Fair value hedging [Member] \| Net gains from trading and securities [Member] \| Commodity contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0	0	0
Fair value hedging [Member] \| Other noninterest income [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Total gains (losses) (pre-tax) on interest rate contracts	8	39	29	77
Fair value hedging [Member] \| Other noninterest income [Member] \| Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	0	0	0	0
Recognized on derivatives	0	0	0	0
Recognized on hedged items	0	0	0	0
Total gains (losses) (pre-tax) on interest rate contracts	0	0	0	0
Fair value hedging [Member] \| Other noninterest income [Member] \| Foreign exchange contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	0	0	0	0
Recognized on derivatives	0	(7)	0	20
Recognized on hedged items	0	6	0	(15)
Total gains (losses) (pre-tax) on interest rate contracts	0	(1)	0	5
Fair value hedging [Member] \| Other noninterest income [Member] \| Commodity contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives	(300)	84	(532)	181
Recognized on hedged items	308	(44)	561	(109)
Total gains (losses) (pre-tax) on interest rate contracts	8	40	29	72
Fair value hedging [Member] \| Derivative gains (losses) [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Total gains (losses) (pre-tax) on interest rate contracts	(951)	(781)	(2,745)	(1,973)
Fair value hedging [Member] \| Derivative gains (losses) [Member] \| Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	(903)	(807)	(2,635)	(1,851)
Recognized on derivatives	4,627	(3,297)	2,069	(3,460)
Recognized on hedged items	(4,643)	3,325	(2,106)	3,465
Total gains (losses) (pre-tax) on interest rate contracts	(919)	(779)	(2,672)	(1,846)
Fair value hedging [Member] \| Derivative gains (losses) [Member] \| Foreign exchange contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to cash flows on derivatives	(34)	(38)	(92)	(189)
Recognized on derivatives	106	(17)	14	44
Recognized on hedged items	(112)	13	(24)	(54)
Total gains (losses) (pre-tax) on interest rate contracts	(40)	(42)	(102)	(199)
Fair value hedging [Member] \| Derivative gains (losses) [Member] \| Commodity contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives	(300)	84	(532)	181
Recognized on hedged items	308	(44)	561	(109)
Total gains (losses) (pre-tax) on interest rate contracts	$ 8	$ 40	$ 29	$ 72

Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement.

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Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

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