Strategic Lines of Business (Business Segment Financial Results) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Earnings summary:
Net interest income (expense)		$ 708	$ 456
Provision for credit losses		30	(11)
Noninterest income		282	244
Noninterest expenses		551	473
Provision (benefit) for income taxes		85	49
Net income (loss)		324	189
Net credit-related (recoveries) charge-offs		(2)	8
Selected average balances:
Assets		85,138	91,150
Loans		53,468	48,273
Deposits		$ 67,833	$ 79,103
Return on average assets	[1]	1.54%	0.84%
Efficiency ratio	[2]	55.53%	66.91%
Commercial Bank
Earnings summary:
Net interest income (expense)		$ 531	$ 356
Provision for credit losses		26	(23)
Noninterest income		153	132
Noninterest expenses		251	234
Provision (benefit) for income taxes		87	65
Net income (loss)		320	212
Net credit-related (recoveries) charge-offs		(2)	9
Selected average balances:
Assets		50,162	45,024
Loans		46,065	41,545
Deposits		$ 36,396	$ 46,039
Return on average assets	[1]	2.57%	1.71%
Efficiency ratio	[2]	36.74%	47.26%
Retail Bank
Earnings summary:
Net interest income (expense)		$ 222	$ 130
Provision for credit losses		6	7
Noninterest income		28	28
Noninterest expenses		165	164
Provision (benefit) for income taxes		19	(4)
Net income (loss)		60	(9)
Net credit-related (recoveries) charge-offs		0	0
Selected average balances:
Assets		2,916	2,807
Loans		2,203	2,013
Deposits		$ 25,101	$ 26,861
Return on average assets	[1]	0.97%	(0.14%)
Efficiency ratio	[2]	65.26%	103.82%
Wealth Management
Earnings summary:
Net interest income (expense)		$ 58	$ 36
Provision for credit losses		(2)	2
Noninterest income		73	72
Noninterest expenses		106	83
Provision (benefit) for income taxes		6	6
Net income (loss)		21	17
Net credit-related (recoveries) charge-offs		0	(1)
Selected average balances:
Assets		5,347	4,857
Loans		5,200	4,713
Deposits		$ 4,704	$ 5,303
Return on average assets	[1]	1.62%	1.21%
Efficiency ratio	[2]	81.17%	76.73%
Finance
Earnings summary:
Net interest income (expense)		$ (123)	$ (64)
Provision for credit losses		0	0
Noninterest income		23	18
Noninterest expenses		1	0
Provision (benefit) for income taxes		(25)	(12)
Net income (loss)		(76)	(34)
Net credit-related (recoveries) charge-offs		0	0
Selected average balances:
Assets		20,089	19,242
Loans		0	0
Deposits		1,523	680
Other
Earnings summary:
Net interest income (expense)		20	(2)
Provision for credit losses		0	3
Noninterest income		5	(6)
Noninterest expenses		28	(8)
Provision (benefit) for income taxes		(2)	(6)
Net income (loss)		(1)	3
Net credit-related (recoveries) charge-offs		0	0
Selected average balances:
Assets		6,624	19,220
Loans		0	2
Deposits		$ 109	$ 220

[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.