Loans and Related Allowance for Credit Losses (Commercial Lending Asset Quality Indicators) (Details) - USD ($) $ in Millions	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans, net	$ 288,372	[1]	$ 241,928	[1]	$ 239,843
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	33,040		37,554
Year two	18,072		22,152
Year three	19,883		13,389
Year four	13,112		10,331
Year five	10,577		7,634
Prior	23,114		16,824
Revolving Loans	75,160		59,247
Revolving Loans Converted to Term	120		72
Total loans, net	193,078		167,203		$ 160,602
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	27,387		32,019
Year two	12,421		14,042
Year three	11,546		8,787
Year four	7,347		6,290
Year five	6,851		4,466
Prior	12,583		7,492
Revolving Loans	74,678		58,905
Revolving Loans Converted to Term	120		72
Total loans, net	152,933		132,073
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	4,404		4,028
Year two	4,407		6,816
Year three	7,354		3,574
Year four	5,054		3,264
Year five	3,200		2,741
Prior	9,114		7,951
Revolving Loans	482		342
Total loans, net	34,015		28,716
Commercial | Equipment lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,249		1,507
Year two	1,244		1,294
Year three	983		1,028
Year four	711		777
Year five	526		427
Prior	1,417		1,381
Total loans, net	6,130		6,414
Pass Rated | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	27,104		31,680
Year two	12,053		13,340
Year three	10,731		8,209
Year four	6,698		5,956
Year five	6,355		4,242
Prior	11,759		7,141
Revolving Loans	71,230		54,775
Revolving Loans Converted to Term	90		53
Total loans, net	146,020		125,396
Pass Rated | Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	4,110		3,709
Year two	4,109		6,268
Year three	6,355		3,426
Year four	4,234		2,841
Year five	2,634		2,341
Prior	7,562		6,792
Revolving Loans	436		218
Total loans, net	29,440		25,595
Pass Rated | Commercial | Equipment lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,212		1,429
Year two	1,190		1,202
Year three	942		942
Year four	682		738
Year five	507		405
Prior	1,410		1,350
Total loans, net	5,943		6,066
Criticized | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	283		339
Year two	368		702
Year three	815		578
Year four	649		334
Year five	496		224
Prior	824		351
Revolving Loans	3,448		4,130
Revolving Loans Converted to Term	30		19
Total loans, net	6,913		6,677
Criticized | Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	294		319
Year two	298		548
Year three	999		148
Year four	820		423
Year five	566		400
Prior	1,552		1,159
Revolving Loans	46		124
Total loans, net	4,575		3,121
Criticized | Commercial | Equipment lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	37		78
Year two	54		92
Year three	41		86
Year four	29		39
Year five	19		22
Prior	7		31
Total loans, net	$ 187		$ 348

[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.9 billion, Loans of $1.5 billion and Other assets of $0.1 billion at December 31, 2021 and Loans held for sale of $1.2 billion, Loans of $1.4 billion and Other assets of $0.1 billion at December 31, 2020.