Loans and Related Allowance for Credit Losses (Commercial Lending Asset Quality Indicators) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Total loans, net	[1]	$ 318,416		$ 318,416		$ 326,025
Gross charge-offs
Total		233	$ 222	808	$ 668
Commercial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		24,223		24,223		53,984
Year two		42,444		42,444		18,123
Year three		13,806		13,806		12,997
Year four		9,973		9,973		13,538
Year five		11,029		11,029		8,745
Prior		25,127		25,127		24,043
Revolving Loans		89,188		89,188		93,519
Revolving Loans Converted to Term		642		642		100
Total loans, net		216,432		216,432		225,049
Gross charge-offs
Year one				18
Year two				21
Year three				29
Year four				11
Year five				32
Prior				115
Revolving Loans				90
Revolving Loans Converted to Term				11
Total		72	$ 73	327	$ 162
Commercial | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		19,328		19,328		42,944
Year two		31,165		31,165		12,916
Year three		9,219		9,219		8,411
Year four		6,416		6,416		6,560
Year five		4,903		4,903		4,506
Prior		13,662		13,662		13,716
Revolving Loans		88,828		88,828		93,066
Revolving Loans Converted to Term		642		642		100
Total loans, net		174,163		174,163		182,219
Gross charge-offs
Year one				17
Year two				19
Year three				27
Year four				7
Year five				2
Prior				19
Revolving Loans				90
Revolving Loans Converted to Term				11
Total				192
Commercial | Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		3,701		3,701		9,183
Year two		9,693		9,693		4,190
Year three		3,752		3,752		3,588
Year four		2,746		2,746		6,269
Year five		5,582		5,582		3,812
Prior		9,942		9,942		8,821
Revolving Loans		360		360		453
Total loans, net		35,776		35,776		36,316
Gross charge-offs
Year five				29
Prior				95
Total				124
Commercial | Equipment lease financing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		1,194		1,194		1,857
Year two		1,586		1,586		1,017
Year three		835		835		998
Year four		811		811		709
Year five		544		544		427
Prior		1,523		1,523		1,506
Total loans, net		6,493		6,493		6,514
Gross charge-offs
Year one				1
Year two				2
Year three				2
Year four				4
Year five				1
Prior				1
Total				11
Pass Rated | Commercial | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		18,791		18,791		41,685
Year two		29,249		29,249		12,493
Year three		8,476		8,476		8,134
Year four		6,061		6,061		6,261
Year five		4,654		4,654		4,209
Prior		12,952		12,952		13,165
Revolving Loans		84,123		84,123		89,384
Revolving Loans Converted to Term		603		603		69
Total loans, net		164,909		164,909		175,400
Pass Rated | Commercial | Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		3,592		3,592		8,835
Year two		9,008		9,008		4,153
Year three		3,282		3,282		3,266
Year four		2,376		2,376		5,511
Year five		4,918		4,918		3,005
Prior		8,062		8,062		7,454
Revolving Loans		342		342		450
Total loans, net		31,580		31,580		32,674
Pass Rated | Commercial | Equipment lease financing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		1,126		1,126		1,797
Year two		1,507		1,507		962
Year three		779		779		942
Year four		761		761		670
Year five		506		506		410
Prior		1,469		1,469		1,495
Total loans, net		6,148		6,148		6,276
Criticized | Commercial | Commercial and industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		537		537		1,259
Year two		1,916		1,916		423
Year three		743		743		277
Year four		355		355		299
Year five		249		249		297
Prior		710		710		551
Revolving Loans		4,705		4,705		3,682
Revolving Loans Converted to Term		39		39		31
Total loans, net		9,254		9,254		6,819
Criticized | Commercial | Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		109		109		348
Year two		685		685		37
Year three		470		470		322
Year four		370		370		758
Year five		664		664		807
Prior		1,880		1,880		1,367
Revolving Loans		18		18		3
Total loans, net		4,196		4,196		3,642
Criticized | Commercial | Equipment lease financing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		68		68		60
Year two		79		79		55
Year three		56		56		56
Year four		50		50		39
Year five		38		38		17
Prior		54		54		11
Total loans, net		$ 345		$ 345		$ 238

[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $0.9 billion, Loans held for investment of $1.2 billion and Other assets of $0.1 billion at September 30, 2023. Comparable amounts at December 31, 2022 were $0.9 billion, $1.3 billion and $0.1 billion, respectively.