Loans and Related Allowance for Credit Losses (Commercial Lending Asset Quality Indicators) (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans, net	[1]	$ 294,457	$ 288,372
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		9,505	33,040
Year two		25,074	18,072
Year three		17,584	19,883
Year four		19,495	13,112
Year five		12,407	10,577
Prior		32,662	23,114
Revolving Loans		81,424	75,160
Revolving Loans Converted to Term		110	120
Total loans, net		198,261	193,078
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		7,013	27,387
Year two		20,008	12,421
Year three		12,055	11,546
Year four		11,342	7,347
Year five		6,930	6,851
Prior		19,417	12,583
Revolving Loans		80,999	74,678
Revolving Loans Converted to Term		110	120
Total loans, net		157,874	152,933
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		2,115	4,404
Year two		3,862	4,407
Year three		4,340	7,354
Year four		7,227	5,054
Year five		4,827	3,200
Prior		11,375	9,114
Revolving Loans		425	482
Total loans, net		34,171	34,015
Commercial | Equipment lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		377	1,249
Year two		1,204	1,244
Year three		1,189	983
Year four		926	711
Year five		650	526
Prior		1,870	1,417
Total loans, net		6,216	6,130
Pass Rated | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		6,934	27,104
Year two		19,775	12,053
Year three		11,724	10,731
Year four		10,502	6,698
Year five		6,410	6,355
Prior		18,188	11,759
Revolving Loans		77,672	71,230
Revolving Loans Converted to Term		82	90
Total loans, net		151,287	146,020
Pass Rated | Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		2,013	4,110
Year two		3,704	4,109
Year three		4,025	6,355
Year four		6,254	4,234
Year five		3,837	2,634
Prior		9,318	7,562
Revolving Loans		376	436
Total loans, net		29,527	29,440
Pass Rated | Commercial | Equipment lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		368	1,212
Year two		1,152	1,190
Year three		1,128	942
Year four		878	682
Year five		620	507
Prior		1,845	1,410
Total loans, net		5,991	5,943
Criticized | Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		79	283
Year two		233	368
Year three		331	815
Year four		840	649
Year five		520	496
Prior		1,229	824
Revolving Loans		3,327	3,448
Revolving Loans Converted to Term		28	30
Total loans, net		6,587	6,913
Criticized | Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		102	294
Year two		158	298
Year three		315	999
Year four		973	820
Year five		990	566
Prior		2,057	1,552
Revolving Loans		49	46
Total loans, net		4,644	4,575
Criticized | Commercial | Equipment lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		9	37
Year two		52	54
Year three		61	41
Year four		48	29
Year five		30	19
Prior		25	7
Total loans, net		$ 225	$ 187

[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.3 billion, Loans held for investment of $1.4 billion and Other assets of $0.1 billion at March 31, 2022. Comparable amounts at December 31, 2021 were $1.9 billion, $1.5 billion and $0.1 billion, respectively.