Strategic Lines of Business (Business Segment Financial Results) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings summary:
Net interest income (expense)		$ 533	$ 621	$ 1,081	$ 1,329
Provision for credit losses		0	33	14	63
Noninterest income		291	303	527	585
Noninterest expenses		555	535	1,158	1,086
Provision (benefit) for income taxes		63	83	92	168
Net income (loss)		206	273	344	597
Net charge-offs		11	(2)	25	(4)
Selected average balances:
Assets		79,207	90,355	81,412	87,761
Loans		51,071	55,368	51,221	54,423
Deposits		$ 63,055	$ 64,332	$ 64,183	$ 66,072
Return on average assets	[1]	1.05%	1.21%	0.85%	1.37%
Efficiency ratio	[2]	67.77%	57.70%	72.24%	56.58%
Commercial Bank
Earnings summary:
Net interest income (expense)		$ 465	$ 504	$ 942	$ 1,045
Provision for credit losses		0	33	16	59
Noninterest income		146	158	293	311
Noninterest expenses		250	248	525	499
Provision (benefit) for income taxes		85	90	142	180
Net income (loss)		276	291	552	618
Net charge-offs		8	(3)	22	(5)
Selected average balances:
Assets		45,843	50,945	46,163	50,132
Loans		43,709	47,813	43,810	46,943
Deposits		$ 31,176	$ 31,030	$ 31,694	$ 33,883
Return on average assets	[1]	2.42%	2.29%	2.41%	2.48%
Efficiency ratio	[2]	40.97%	37.44%	42.53%	36.82%
Retail Bank
Earnings summary:
Net interest income (expense)		$ 203	$ 214	$ 404	$ 436
Provision for credit losses		1	(4)	0	2
Noninterest income		33	29	61	57
Noninterest expenses		177	171	358	336
Provision (benefit) for income taxes		14	18	22	37
Net income (loss)		44	58	85	118
Net charge-offs		2	0	2	0
Selected average balances:
Assets		3,029	2,931	3,028	2,923
Loans		2,322	2,214	2,309	2,209
Deposits		$ 24,590	$ 24,002	$ 24,487	$ 24,576
Return on average assets	[1]	0.71%	0.94%	0.68%	0.95%
Efficiency ratio	[2]	76.15%	69.73%	77.63%	67.54%
Wealth Management
Earnings summary:
Net interest income (expense)		$ 48	$ 51	$ 94	$ 109
Provision for credit losses		(2)	2	(1)	(1)
Noninterest income		78	83	143	156
Noninterest expenses		88	89	185	196
Provision (benefit) for income taxes		10	11	11	17
Net income (loss)		30	32	42	53
Net charge-offs		1	1	1	1
Selected average balances:
Assets		5,299	5,624	5,372	5,486
Loans		5,026	5,341	5,089	5,271
Deposits		$ 3,951	$ 3,942	$ 3,925	$ 4,326
Return on average assets	[1]	2.25%	2.31%	1.56%	1.98%
Efficiency ratio	[2]	70.78%	66.21%	78.32%	73.61%
Finance
Earnings summary:
Net interest income (expense)		$ (220)	$ (173)	$ (437)	$ (306)
Provision for credit losses		0	0	0	0
Noninterest income		33	29	23	52
Noninterest expenses		1	2	4	3
Provision (benefit) for income taxes		(46)	(36)	(87)	(64)
Net income (loss)		(142)	(110)	(331)	(193)
Net charge-offs		0	0	0	0
Selected average balances:
Assets		18,448	20,649	18,752	20,794
Loans		0	0	0	0
Deposits		3,032	4,980	3,786	2,916
Other
Earnings summary:
Net interest income (expense)		37	25	78	45
Provision for credit losses		1	2	(1)	3
Noninterest income		1	4	7	9
Noninterest expenses		39	25	86	52
Provision (benefit) for income taxes		0	0	4	(2)
Net income (loss)		(2)	2	(4)	1
Net charge-offs		0	0	0	0
Selected average balances:
Assets		6,588	10,206	8,097	8,426
Loans		14	0	13	0
Deposits		$ 306	$ 378	$ 291	$ 371

[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.