Derivatives, Gains (Losses) Recognized on Fair Value Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Line Items Presented in the Consolidated Statement of Income and Other Comprehensive Income [Abstract]
Debt securities	$ 3,043	$ 2,354	$ 8,308	$ 6,865
Deposits	(513)	(99)	(754)	(303)
Long-term debt	(1,553)	(745)	(3,325)	(2,483)
Other	397	609	1,507	2,283
Total recorded in OCI, Derivative gains (losses)	(1,476)	50	(1,560)	134
Derivatives (Textual) [Abstract]
Deferred net losses on derivatives in other comprehensive income			$ 491
Maximum length of time hedged in cash flow hedge			10 years
Fair value hedging [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives, Total recorded in OCI	30	29	$ 140	40
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	30	29	140	40
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	69	(58)	12	(129)
Fair value hedging [Member] | Debt securities [Member] | Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to interest settlements on derivatives	53	(65)	(33)	(200)
Recognized on derivatives	1,821	138	3,851	964
Recognized on hedged items	(1,805)	(139)	(3,806)	(945)
Total gains (losses) (pre-tax) on interest rate contracts	69	(66)	12	(181)
Fair value hedging [Member] | Debt securities [Member] | Foreign exchange contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to interest settlements on derivatives	0	9	0	52
Recognized on derivatives	0	0	0	3
Recognized on hedged items	0	(1)	0	(3)
Total gains (losses) (pre-tax) on interest rate contracts	0	8	0	52
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	9	68	69	230
Fair value hedging [Member] | Deposits [Member] | Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to interest settlements on derivatives	8	68	72	233
Recognized on derivatives	(98)	(64)	(313)	(248)
Recognized on hedged items	99	64	310	245
Total gains (losses) (pre-tax) on interest rate contracts	9	68	69	230
Fair value hedging [Member] | Deposits [Member] | Foreign exchange contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to interest settlements 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	(142)	516	535	1,503
Fair value hedging [Member] | Long-term debt [Member] | Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to interest settlements on derivatives	(66)	534	751	1,625
Recognized on derivatives	(6,218)	(1,159)	(18,289)	(5,777)
Recognized on hedged items	6,183	1,159	18,124	5,701
Total gains (losses) (pre-tax) on interest rate contracts	(101)	534	586	1,549
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 interest settlements on derivatives	(69)	4	(86)	7
Recognized on derivatives	(283)	(94)	(1,054)	(363)
Recognized on hedged items	311	72	1,089	310
Total gains (losses) (pre-tax) on interest rate contracts	(41)	(18)	(51)	(46)
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] | Other noninterest income [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Total gains (losses) (pre-tax) on interest rate contracts	(29)	(4)	(55)	(19)
Fair value hedging [Member] | Other noninterest income [Member] | Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to interest settlements 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 interest settlements on derivatives	0	0	0	0
Recognized on derivatives	(663)	(436)	(1,834)	73
Recognized on hedged items	630	431	1,769	(89)
Total gains (losses) (pre-tax) on interest rate contracts	(33)	(5)	(65)	(16)
Fair value hedging [Member] | Other noninterest income [Member] | Commodity contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives	94	93	230	126
Recognized on hedged items	(90)	(92)	(220)	(129)
Total gains (losses) (pre-tax) on interest rate contracts	4	1	10	(3)
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	(93)	522	561	1,585
Fair value hedging [Member] | Derivative gains (losses) [Member] | Interest contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Amounts related to interest settlements on derivatives	(5)	537	790	1,658
Recognized on derivatives	(4,495)	(1,085)	(14,751)	(5,061)
Recognized on hedged items	4,477	1,084	14,628	5,001
Total gains (losses) (pre-tax) on interest rate contracts	(23)	536	667	1,598
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 interest settlements on derivatives	(69)	13	(86)	59
Recognized on derivatives	(946)	(530)	(2,888)	(287)
Recognized on hedged items	941	502	2,858	218
Total gains (losses) (pre-tax) on interest rate contracts	(74)	(15)	(116)	(10)
Fair value hedging [Member] | Derivative gains (losses) [Member] | Commodity contracts [Member]
Total gains (losses) (pre-tax) recognized on fair value hedges
Recognized on derivatives	94	93	230	126
Recognized on hedged items	(90)	(92)	(220)	(129)
Total gains (losses) (pre-tax) on interest rate contracts	$ 4	$ 1	$ 10	$ (3)