Loans and Related Allowance for Credit Losses (Credit Quality Indicators for Residential Real Estate and Home Equity Loan Classes) (Details) - USD ($) $ in Millions		Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans, net	[1]	$ 326,025	$ 288,372
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		10,594	16,961
Year two		16,650	8,473
Year three		7,392	3,114
Year four		2,482	1,133
Year five		878	1,688
Prior		7,893	8,343
Total loans, net		45,889	39,712
Residential real estate | FICO Score, Greater Than Or Equal To 780
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		6,825	11,110
Year two		12,596	5,898
Year three		5,276	1,996
Year four		1,623	596
Year five		463	1,029
Prior		4,027	4,052
Total loans, net		30,810	24,681
Residential real estate | FICO Score, 720 to 779
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		3,172	4,921
Year two		3,024	1,735
Year three		1,369	643
Year four		476	247
Year five		180	345
Prior		1,457	1,619
Total loans, net		9,678	9,510
Residential real estate | FICO Score, 660 to 719
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		514	717
Year two		744	463
Year three		378	255
Year four		189	136
Year five		98	133
Prior		796	796
Total loans, net		2,719	2,500
Residential real estate | FICO Score, Less Than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		63	83
Year two		108	103
Year three		110	96
Year four		88	75
Year five		71	94
Prior		740	848
Total loans, net		1,180	1,299
Residential real estate | No FICO score available
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		11	127
Year two		163	241
Year three		193	87
Year four		67	49
Year five		38	48
Prior		337	359
Total loans, net		809	911
Residential real estate | Government insured or guaranteed loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		9	3
Year two		15	33
Year three		66	37
Year four		39	30
Year five		28	39
Prior		536	669
Total loans, net		693	811
Residential real estate | Greater than 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		4	10
Year two		52	52
Year three		20	21
Year four		10	12
Year five		4	13
Prior		41	77
Total loans, net		131	185
Residential real estate | Greater than or equal to 80% to 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		1,185	1,460
Year two		678	560
Year three		232	221
Year four		84	86
Year five		24	66
Prior		92	190
Total loans, net		2,295	2,583
Residential real estate | Less than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one		9,396	15,213
Year two		15,844	7,822
Year three		7,074	2,834
Year four		2,346	1,004
Year five		822	1,570
Prior		7,220	7,385
Total loans, net		42,702	35,828
Residential real estate | No LTV available
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			275
Year two		61	6
Year three			1
Year four		3	1
Year five
Prior		4	22
Total loans, net		68	305
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			212
Year two		180	2,588
Year three		2,143	1,265
Year four		997	386
Year five		291	562
Prior		2,897	3,291
Revolving Loans		8,902	9,187
Revolving Loans Converted to Term		10,573	6,570
Total loans, net		25,983	24,061
Home equity | FICO Score, Greater Than Or Equal To 780
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			124
Year two		110	1,619
Year three		1,357	692
Year four		554	201
Year five		155	364
Prior		1,791	2,035
Revolving Loans		5,093	5,490
Revolving Loans Converted to Term		5,545	3,320
Total loans, net		14,605	13,845
Home equity | FICO Score, 720 to 779
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			61
Year two		47	666
Year three		515	348
Year four		248	96
Year five		64	116
Prior		567	642
Revolving Loans		2,305	2,283
Revolving Loans Converted to Term		2,843	1,679
Total loans, net		6,589	5,891
Home equity | FICO Score, 660 to 719
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			23
Year two		19	248
Year three		211	167
Year four		140	56
Year five		42	53
Prior		288	327
Revolving Loans		1,146	1,071
Revolving Loans Converted to Term		1,449	872
Total loans, net		3,295	2,817
Home equity | FICO Score, Less Than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			4
Year two		4	53
Year three		57	57
Year four		54	32
Year five		29	28
Prior		242	277
Revolving Loans		342	325
Revolving Loans Converted to Term		671	615
Total loans, net		1,399	1,391
Home equity | No FICO score available
Financing Receivable, Credit Quality Indicator [Line Items]
Year one
Year two			2
Year three		3	1
Year four		1	1
Year five		1	1
Prior		9	10
Revolving Loans		16	18
Revolving Loans Converted to Term		65	84
Total loans, net		95	117
Home equity | Greater than 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			1
Year two		4	16
Year three		14	14
Year four		9	3
Year five		2	2
Prior		15	25
Revolving Loans		268	329
Revolving Loans Converted to Term		137	90
Total loans, net		449	480
Home equity | Greater than or equal to 80% to 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			7
Year two		4	85
Year three		51	62
Year four		27	13
Year five		4	11
Prior		31	66
Revolving Loans		854	990
Revolving Loans Converted to Term		1,149	674
Total loans, net		2,120	1,908
Home equity | Less than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			204
Year two		172	2,487
Year three		2,078	1,189
Year four		961	370
Year five		285	549
Prior		2,851	3,200
Revolving Loans		7,780	7,868
Revolving Loans Converted to Term		9,287	5,806
Total loans, net		$ 23,414	$ 21,673

[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 of $1.3 billion and Other assets of $0.1 billion at December 31, 2022 and Loans held for sale of $1.9 billion, Loans of $1.5 billion and Other assets of $0.1 billion at December 31, 2021.