Loans and Related Allowance for Credit Losses (Rollforward of Allowance for Credit Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 4,791	$ 4,741	$ 4,868
Charge-offs	(1,435)	(1,092)	(985)
Recoveries	394	382	422
Net (charge-offs)	(1,041)	(710)	(563)
Provision for credit losses	741	792	439
Other	(5)	3	(3)
Ending balance	4,486	4,791	4,741
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance	663	694	662
Provision for (recapture of) credit losses	56	(31)	32
Other
Ending balance	719	663	694
Allowance for credit loss and off-balance sheet liability	5,205	5,454	5,435
Allowances for investment securities and other financial assets	114	120	176
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance		(35)
Ending balance			(35)
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,791	4,706	4,868
Ending balance		4,791	4,706
Commercial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,259	3,114	3,185
Charge-offs	(720)	(442)	(307)
Recoveries	149	137	114
Net (charge-offs)	(571)	(305)	(193)
Provision for credit losses	464	447	126
Other	(4)	3	(4)
Ending balance	3,148	3,259	3,114
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance	545	613	564
Provision for (recapture of) credit losses	36	(68)	49
Other	(1)
Ending balance	580	545	613
Allowance for credit loss and off-balance sheet liability	3,728	3,804	3,727
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance
Ending balance
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,259	3,114	3,185
Ending balance		3,259	3,114
Consumer
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,532	1,627	1,683
Charge-offs	(715)	(650)	(678)
Recoveries	245	245	308
Net (charge-offs)	(470)	(405)	(370)
Provision for credit losses	277	345	313
Other	(1)		1
Ending balance	1,338	1,532	1,627
Allowance For Unfunded Lending Related Commitments [Roll Forward]
Beginning balance	118	81	98
Provision for (recapture of) credit losses	20	37	(17)
Other	1
Ending balance	139	118	81
Allowance for credit loss and off-balance sheet liability	1,477	1,650	1,708
Consumer | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance		(35)
Ending balance			(35)
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,532	1,592	1,683
Ending balance		$ 1,532	$ 1,592