Loans and Related Allowance for Credit Losses (Home Equity and Residential Real Estate Credit Quality Indicators) (Details) - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans, net	[1]	$ 310,800	$ 288,372
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		6,977	16,961
Year two		16,808	8,473
Year three		7,716	3,114
Year four		2,630	1,133
Year five		954	1,688
Prior		8,632	8,343
Total loans, net		43,717	39,712
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			212
Year two		190	2,588
Year three		2,293	1,265
Year four		1,088	386
Year five		323	562
Prior		3,262	3,291
Revolving Loans		8,742	9,187
Revolving Loans Converted to Term		8,795	6,570
Total loans, net		24,693	24,061
Greater than or equal to 780 | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		3,782	11,110
Year two		12,363	5,898
Year three		5,486	1,996
Year four		1,721	596
Year five		508	1,029
Prior		4,469	4,052
Total loans, net		28,329	24,681
Greater than or equal to 780 | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			124
Year two		115	1,619
Year three		1,457	692
Year four		608	201
Year five		172	364
Prior		2,020	2,035
Revolving Loans		5,177	5,490
Revolving Loans Converted to Term		4,694	3,320
Total loans, net		14,243	13,845
720 to 779 | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		2,839	4,921
Year two		3,473	1,735
Year three		1,498	643
Year four		503	247
Year five		204	345
Prior		1,609	1,619
Total loans, net		10,126	9,510
720 to 779 | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			61
Year two		51	666
Year three		570	348
Year four		280	96
Year five		73	116
Prior		638	642
Revolving Loans		2,234	2,283
Revolving Loans Converted to Term		2,323	1,679
Total loans, net		6,169	5,891
660 to 719 | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		317	717
Year two		699	463
Year three		380	255
Year four		218	136
Year five		113	133
Prior		825	796
Total loans, net		2,552	2,500
660 to 719 | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			23
Year two		20	248
Year three		212	167
Year four		144	56
Year five		46	53
Prior		324	327
Revolving Loans		1,013	1,071
Revolving Loans Converted to Term		1,098	872
Total loans, net		2,857	2,817
Less than 660 | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		35	83
Year two		113	103
Year three		111	96
Year four		88	75
Year five		65	94
Prior		834	848
Total loans, net		1,246	1,299
Less than 660 | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			4
Year two		4	53
Year three		51	57
Year four		55	32
Year five		31	28
Prior		270	277
Revolving Loans		298	325
Revolving Loans Converted to Term		608	615
Total loans, net		1,317	1,391
No FICO score available | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		3	127
Year two		154	241
Year three		204	87
Year four		68	49
Year five		40	48
Prior		349	359
Total loans, net		818	911
No FICO score available | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year two			2
Year three		3	1
Year four		1	1
Year five		1	1
Prior		10	10
Revolving Loans		20	18
Revolving Loans Converted to Term		72	84
Total loans, net		107	117
Government insured or guaranteed loans | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		1	3
Year two		6	33
Year three		37	37
Year four		32	30
Year five		24	39
Prior		546	669
Total loans, net		646	811
Greater than 100% | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			10
Year two		65	52
Year three		43	21
Year four		15	12
Year five		6	13
Prior		46	77
Total loans, net		175	185
Greater than 100% | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			1
Year two		1	16
Year three		15	14
Year four		10	3
Year five		2	2
Prior		19	25
Revolving Loans		246	329
Revolving Loans Converted to Term		87	90
Total loans, net		380	480
Greater than or equal to 80% to 100% | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		1,083	1,460
Year two		682	560
Year three		323	221
Year four		112	86
Year five		47	66
Prior		135	190
Total loans, net		2,382	2,583
Greater than or equal to 80% to 100% | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			7
Year two		5	85
Year three		65	62
Year four		38	13
Year five		6	11
Prior		43	66
Revolving Loans		795	990
Revolving Loans Converted to Term		945	674
Total loans, net		1,897	1,908
Less than 80% | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		5,893	15,213
Year two		16,007	7,822
Year three		7,312	2,834
Year four		2,471	1,004
Year five		877	1,570
Prior		7,896	7,385
Total loans, net		40,456	35,828
Less than 80% | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			204
Year two		184	2,487
Year three		2,213	1,189
Year four		1,040	370
Year five		315	549
Prior		3,200	3,200
Revolving Loans		7,701	7,868
Revolving Loans Converted to Term		7,763	5,806
Total loans, net		22,416	21,673
No LTV available | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			275
Year two		48	6
Year three		1	1
Year four			1
Prior		9	22
Total loans, net		$ 58	$ 305

[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.0 billion, Loans held for investment of $1.3 billion and Other assets of $0.1 billion at June 30, 2022. Comparable amounts at December 31, 2021 were $1.9 billion, $1.5 billion and $0.1 billion, respectively.