Loans and Related Allowance for Credit Losses (Home Equity and Residential Real Estate Credit Quality Indicators) (Details) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans, net	[1]	$ 315,400	$ 288,372
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		9,150	16,961
Year two		16,834	8,473
Year three		7,488	3,114
Year four		2,517	1,133
Year five		901	1,688
Prior		8,167	8,343
Total loans, net		45,057	39,712
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			212
Year two		185	2,588
Year three		2,207	1,265
Year four		1,038	386
Year five		305	562
Prior		3,065	3,291
Revolving Loans		8,829	9,187
Revolving Loans Converted to Term		9,738	6,570
Total loans, net		25,367	24,061
Greater than or equal to 780 | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		5,416	11,110
Year two		12,138	5,898
Year three		5,267	1,996
Year four		1,644	596
Year five		465	1,029
Prior		4,113	4,052
Total loans, net		29,043	24,681
Greater than or equal to 780 | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			124
Year two		109	1,619
Year three		1,400	692
Year four		577	201
Year five		162	364
Prior		1,895	2,035
Revolving Loans		5,154	5,490
Revolving Loans Converted to Term		5,123	3,320
Total loans, net		14,420	13,845
720 to 779 | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		3,152	4,921
Year two		3,294	1,735
Year three		1,457	643
Year four		499	247
Year five		212	345
Prior		1,610	1,619
Total loans, net		10,224	9,510
720 to 779 | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			61
Year two		51	666
Year three		537	348
Year four		269	96
Year five		69	116
Prior		602	642
Revolving Loans		2,274	2,283
Revolving Loans Converted to Term		2,582	1,679
Total loans, net		6,384	5,891
660 to 719 | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		442	717
Year two		752	463
Year three		403	255
Year four		190	136
Year five		91	133
Prior		806	796
Total loans, net		2,684	2,500
660 to 719 | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			23
Year two		21	248
Year three		212	167
Year four		138	56
Year five		44	53
Prior		307	327
Revolving Loans		1,059	1,071
Revolving Loans Converted to Term		1,331	872
Total loans, net		3,112	2,817
Less than 660 | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		42	83
Year two		109	103
Year three		112	96
Year four		83	75
Year five		71	94
Prior		775	848
Total loans, net		1,192	1,299
Less than 660 | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			4
Year two		4	53
Year three		55	57
Year four		53	32
Year five		29	28
Prior		251	277
Revolving Loans		324	325
Revolving Loans Converted to Term		633	615
Total loans, net		1,349	1,391
No FICO score available | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		95	127
Year two		532	241
Year three		199	87
Year four		66	49
Year five		38	48
Prior		332	359
Total loans, net		1,262	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		18	18
Revolving Loans Converted to Term		69	84
Total loans, net		102	117
Government insured or guaranteed loans | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		3	3
Year two		9	33
Year three		50	37
Year four		35	30
Year five		24	39
Prior		531	669
Total loans, net		652	811
Greater than 100% | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			10
Year two		46	52
Year three		24	21
Year four		6	12
Year five		6	13
Prior		40	77
Total loans, net		122	185
Greater than 100% | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			1
Year two		2	16
Year three		12	14
Year four		7	3
Year five		1	2
Prior		14	25
Revolving Loans		220	329
Revolving Loans Converted to Term		95	90
Total loans, net		351	480
Greater than or equal to 80% to 100% | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		979	1,460
Year two		529	560
Year three		173	221
Year four		67	86
Year five		19	66
Prior		95	190
Total loans, net		1,862	2,583
Greater than or equal to 80% to 100% | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			7
Year two		4	85
Year three		52	62
Year four		27	13
Year five		4	11
Prior		30	66
Revolving Loans		748	990
Revolving Loans Converted to Term		1,058	674
Total loans, net		1,923	1,908
Less than 80% | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		8,168	15,213
Year two		16,197	7,822
Year three		7,240	2,834
Year four		2,409	1,004
Year five		852	1,570
Prior		7,493	7,385
Total loans, net		42,359	35,828
Less than 80% | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			204
Year two		179	2,487
Year three		2,143	1,189
Year four		1,004	370
Year five		300	549
Prior		3,021	3,200
Revolving Loans		7,861	7,868
Revolving Loans Converted to Term		8,585	5,806
Total loans, net		23,093	21,673
No LTV available | Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			275
Year two		53	6
Year three		1	1
Year four			1
Prior		8	22
Total loans, net		$ 62	$ 305

[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.1 billion, Loans held for investment of $1.3 billion and Other assets of $0.1 billion at September 30, 2022. Comparable amounts at December 31, 2021 were $1.9 billion, $1.5 billion and $0.1 billion, respectively.