Loans and Related Allowance for Credit Losses (Home Equity and Residential Real Estate Credit Quality Indicators) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Total loans, net	[1]	$ 326,475	$ 326,025
Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		1,240	10,594
Year two		10,470	16,650
Year three		16,213	7,392
Year four		7,219	2,482
Year five		2,418	878
Prior		8,507	7,893
Total loans, net		46,067	45,889
Gross charge-offs
Year four		1
Prior		2
Total		3
Home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year two			180
Year three		176	2,143
Year four		2,090	997
Year five		963	291
Prior		3,028	2,897
Revolving Loans		8,715	8,902
Revolving Loans Converted to Term		11,231	10,573
Total loans, net		26,203	25,983
Gross charge-offs
Prior		2
Revolving Loans
Revolving Loans Converted to Term		4
Total		6
Greater than or equal to 780 | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		520	6,825
Year two		7,179	12,596
Year three		12,230	5,276
Year four		5,078	1,623
Year five		1,533	463
Prior		4,291	4,027
Total loans, net		30,831	30,810
Greater than or equal to 780 | Home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year two			110
Year three		109	1,357
Year four		1,297	554
Year five		520	155
Prior		1,839	1,791
Revolving Loans		4,941	5,093
Revolving Loans Converted to Term		5,823	5,545
Total loans, net		14,529	14,605
720 to 779 | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		556	3,172
Year two		2,656	3,024
Year three		2,957	1,369
Year four		1,364	476
Year five		511	180
Prior		1,651	1,457
Total loans, net		9,695	9,678
720 to 779 | Home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year two			47
Year three		44	515
Year four		523	248
Year five		254	64
Prior		603	567
Revolving Loans		2,237	2,305
Revolving Loans Converted to Term		2,996	2,843
Total loans, net		6,657	6,589
660 to 719 | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		87	514
Year two		541	744
Year three		768	378
Year four		404	189
Year five		182	98
Prior		868	796
Total loans, net		2,850	2,719
660 to 719 | Home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year two			19
Year three		18	211
Year four		205	140
Year five		130	42
Prior		316	288
Revolving Loans		1,160	1,146
Revolving Loans Converted to Term		1,615	1,449
Total loans, net		3,444	3,295
Less than 660 | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		9	63
Year two		64	108
Year three		133	110
Year four		121	88
Year five		91	71
Prior		807	740
Total loans, net		1,225	1,180
Less than 660 | Home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year two			4
Year three		5	57
Year four		62	54
Year five		58	29
Prior		261	242
Revolving Loans		364	342
Revolving Loans Converted to Term		734	671
Total loans, net		1,484	1,399
No FICO score available | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		67	11
Year two		17	163
Year three		108	193
Year four		182	67
Year five		62	38
Prior		346	337
Total loans, net		782	809
No FICO score available | Home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year three			3
Year four		3	1
Year five		1	1
Prior		9	9
Revolving Loans		13	16
Revolving Loans Converted to Term		63	65
Total loans, net		89	95
Government insured or guaranteed loans | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		1	9
Year two		13	15
Year three		17	66
Year four		70	39
Year five		39	28
Prior		544	536
Total loans, net		684	693
Greater than 100% | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		4	4
Year two		41	52
Year three		98	20
Year four		36	10
Year five		11	4
Prior		46	41
Total loans, net		236	131
Greater than 100% | Home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year two			4
Year three		3	14
Year four		15	9
Year five		8	2
Prior		17	15
Revolving Loans		303	268
Revolving Loans Converted to Term		217	137
Total loans, net		563	449
Greater than or equal to 80% to 100% | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		388	1,185
Year two		4,433	678
Year three		1,469	232
Year four		295	84
Year five		95	24
Prior		134	92
Total loans, net		6,814	2,295
Greater than or equal to 80% to 100% | Home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year two			4
Year three		6	51
Year four		55	27
Year five		27	4
Prior		35	31
Revolving Loans		1,185	854
Revolving Loans Converted to Term		1,892	1,149
Total loans, net		3,200	2,120
Less than 80% | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		804	9,396
Year two		5,983	15,844
Year three		14,606	7,074
Year four		6,818	2,346
Year five		2,273	822
Prior		7,780	7,220
Total loans, net		38,264	42,702
Less than 80% | Home equity
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year two			172
Year three		167	2,078
Year four		2,020	961
Year five		928	285
Prior		2,976	2,851
Revolving Loans		7,227	7,780
Revolving Loans Converted to Term		9,122	9,287
Total loans, net		22,440	23,414
No LTV available | Residential real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Year one		43
Year two			61
Year three		23
Year four			3
Prior		3	4
Total loans, net		$ 69	$ 68

[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 held for investment of $1.3 billion and Other assets of $0.1 billion at both March 31, 2023 and December 31, 2022.