Strategic Lines of Business (Business Segment Financial Results) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings Summary:
Net interest income (expense)		$ 534	$ 601	$ 1,615	$ 1,930
Provision for credit losses		14	14	28	77
Noninterest income		277	295	804	880
Noninterest expenses		562	555	1,720	1,641
Provision (benefit) for income taxes		51	76	143	244
Net income (loss)		184	251	528	848
Net charge-offs		11	6	36	2
Selected Average Balances:
Assets		80,231	89,150	81,016	88,229
Loans		50,861	53,987	51,100	54,276
Deposits		$ 63,896	$ 65,883	$ 64,087	$ 66,009
Return on average assets	[1]	0.92%	1.12%	0.87%	1.29%
Efficiency ratio	[2]	68.80%	61.86%	71.08%	58.26%
Commercial Bank
Earnings Summary:
Net interest income (expense)		$ 464	$ 505	$ 1,406	$ 1,550
Provision for credit losses		6	22	22	81
Noninterest income		149	150	442	460
Noninterest expenses		252	257	777	756
Provision (benefit) for income taxes		83	89	225	269
Net income (loss)		272	287	824	904
Net charge-offs		10	6	32	1
Selected Average Balances:
Assets		45,669	49,459	45,998	49,906
Loans		43,462	46,477	43,693	46,796
Deposits		$ 32,261	$ 31,868	$ 31,845	$ 33,204
Return on average assets	[1]	2.36%	2.30%	2.40%	2.42%
Efficiency ratio	[2]	41.23%	39.34%	42.07%	37.64%
Retail Bank
Earnings Summary:
Net interest income (expense)		$ 205	$ 208	$ 609	$ 644
Provision for credit losses		4	0	4	2
Noninterest income		24	31	85	89
Noninterest expenses		175	175	533	511
Provision (benefit) for income taxes		12	16	34	53
Net income (loss)		38	48	123	167
Net charge-offs		1	0	3	0
Selected Average Balances:
Assets		3,045	2,985	3,033	2,944
Loans		2,347	2,250	2,322	2,223
Deposits		$ 24,224	$ 24,034	$ 24,400	$ 24,394
Return on average assets	[1]	0.63%	0.79%	0.66%	0.89%
Efficiency ratio	[2]	74.24%	72.71%	76.47%	69.23%
Wealth Management
Earnings Summary:
Net interest income (expense)		$ 46	$ 49	$ 140	$ 158
Provision for credit losses		3	(9)	2	(10)
Noninterest income		73	78	216	233
Noninterest expenses		90	102	275	298
Provision (benefit) for income taxes		7	9	18	26
Net income (loss)		19	25	61	77
Net charge-offs		0	0	1	1
Selected Average Balances:
Assets		5,296	5,557	5,346	5,510
Loans		5,042	5,227	5,073	5,257
Deposits		$ 3,844	$ 3,950	$ 3,898	$ 4,200
Return on average assets	[1]	1.47%	1.81%	1.53%	1.92%
Efficiency ratio	[2]	75.35%	79.99%	77.32%	75.68%
Finance
Earnings Summary:
Net interest income (expense)		$ (220)	$ (187)	$ (657)	$ (493)
Provision for credit losses		0	0	0	0
Noninterest income		26	40	49	93
Noninterest expenses		1	1	5	4
Provision (benefit) for income taxes		(48)	(37)	(135)	(101)
Net income (loss)		(147)	(111)	(478)	(303)
Net charge-offs		0	0	0	0
Selected Average Balances:
Assets		18,277	19,832	18,593	20,469
Loans		0	0	0	0
Deposits		3,300	5,711	3,661	3,858
Other
Earnings Summary:
Net interest income (expense)		39	26	117	71
Provision for credit losses		1	1	0	4
Noninterest income		5	(4)	12	5
Noninterest expenses		44	20	130	72
Provision (benefit) for income taxes		(3)	(1)	1	(3)
Net income (loss)		2	2	(2)	3
Net charge-offs		0	0	0	0
Selected Average Balances:
Assets		7,944	11,317	8,046	9,400
Loans		10	33	12	0
Deposits		$ 267	$ 320	$ 283	$ 353

[1] Return on average assets is calculated based on the greater of average assets or average liabilities and attributed equity.

[2] Noninterest expenses as a percentage of the sum of net interest income and noninterest income excluding net gains (losses) from securities, a derivative contract tied to the conversion rate of Visa Class B shares and changes in the value of shares obtained through monetization of warrants.