Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses of Loans and Leases) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 4,741	$ 4,558	$ 4,741	$ 4,868
Charge-offs	(293)	(195)	(575)	(446)
Recoveries	99	112	186	226
Net (charge-offs)	(194)	(83)	(389)	(220)
Provision for (recapture of) credit losses	189	(10)	418	(182)
Other	1	(3)	2	(4)
Ending balance	4,737	4,462	4,737	4,462
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	672	639	694	662
Provision for (recapture of) credit losses	(9)	42	(31)	19
Ending balance	663	681	663	681
Allowance for credit loss	5,400	5,143	5,400	5,143	$ 5,400
Allowances for investment securities and other financial assets	171	163	171	163
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance			(35)
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,741	4,558	4,706	4,868
Total commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,046	3,003	3,114	3,185
Charge-offs	(135)	(37)	(255)	(89)
Recoveries	36	19	61	53
Net (charge-offs)	(99)	(18)	(194)	(36)
Provision for (recapture of) credit losses	195	(45)	220	(208)
Other		(3)	2	(4)
Ending balance	3,142	2,937	3,142	2,937
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	560	587	613	564
Provision for (recapture of) credit losses	(5)	43	(58)	66
Ending balance	555	630	555	630
Allowance for credit loss	3,697	3,567	3,697	3,567
Total commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,046	3,003	3,114	3,185
Total consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,695	1,555	1,627	1,683
Charge-offs	(158)	(158)	(320)	(357)
Recoveries	63	93	125	173
Net (charge-offs)	(95)	(65)	(195)	(184)
Provision for (recapture of) credit losses	(6)	35	198	26
Other	1
Ending balance	1,595	1,525	1,595	1,525
Off-Balance Sheet, Credit Loss, Liability [Roll Forward]
Beginning balance	112	52	81	98
Provision for (recapture of) credit losses	(4)	(1)	27	(47)
Ending balance	108	51	108	51
Allowance for credit loss	1,703	1,576	1,703	1,576
Total consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,695	$ 1,555	$ 1,592	$ 1,683