Loans and Related Allowance for Credit Losses (Consumer Real Estate Secured Asset Quality Indicators) (Details) - USD ($) $ in Millions	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans, net	$ 288,372	[1]	$ 241,928	[1]	$ 239,843
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	16,961		7,996
Year two	8,473		4,158
Year three	3,114		1,172
Year four	1,133		1,942
Year five	1,688		2,069
Prior	8,343		5,223
Total loans, net	39,712		22,560
Residential real estate | FICO Score, Greater Than Or Equal To 780
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	11,110		5,425
Year two	5,898		3,099
Year three	1,996		814
Year four	596		1,432
Year five	1,029		1,538
Prior	4,052		2,551
Total loans, net	24,681		14,859
Residential real estate | FICO Score, 720 to 779
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	4,921		2,268
Year two	1,735		820
Year three	643		220
Year four	247		340
Year five	345		335
Prior	1,619		818
Total loans, net	9,510		4,801
Residential real estate | FICO Score, 660 to 719
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	717		252
Year two	463		161
Year three	255		76
Year four	136		98
Year five	133		92
Prior	796		475
Total loans, net	2,500		1,154
Residential real estate | FICO Score, Less Than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	83		40
Year two	103		48
Year three	96		33
Year four	75		31
Year five	94		41
Prior	848		485
Total loans, net	1,299		678
Residential real estate | No FICO score available
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	127		4
Year two	241		2
Year three	87		2
Year four	49		3
Year five	48		6
Prior	359		129
Total loans, net	911		146
Residential real estate | Government insured or guaranteed loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	3		7
Year two	33		28
Year three	37		27
Year four	30		38
Year five	39		57
Prior	669		765
Total loans, net	811		922
Residential real estate | Greater than 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	10		3
Year two	52		52
Year three	21		26
Year four	12		42
Year five	13		41
Prior	77		160
Total loans, net	185		324
Residential real estate | Greater than or equal to 80% to 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,460		495
Year two	560		422
Year three	221		127
Year four	86		156
Year five	66		124
Prior	190		307
Total loans, net	2,583		1,631
Residential real estate | Less than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	15,213		7,491
Year two	7,822		3,656
Year three	2,834		992
Year four	1,004		1,706
Year five	1,570		1,847
Prior	7,385		3,991
Total loans, net	35,828		19,683
Residential real estate | No LTV available
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	275
Year two	6
Year three	1
Year four	1
Prior	22
Total loans, net	305
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	212		3,434
Year two	2,588		2,000
Year three	1,265		590
Year four	386		830
Year five	562		694
Prior	3,291		4,000
Revolving Loans	9,187		8,794
Revolving Loans Converted to Term	6,570		3,746
Total loans, net	24,061		24,088
Home equity | FICO Score, Greater Than Or Equal To 780
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	124		2,019
Year two	1,619		1,094
Year three	692		311
Year four	201		525
Year five	364		449
Prior	2,035		2,467
Revolving Loans	5,490		5,382
Revolving Loans Converted to Term	3,320		1,480
Total loans, net	13,845		13,727
Home equity | FICO Score, 720 to 779
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	61		1,028
Year two	666		558
Year three	348		153
Year four	96		181
Year five	116		145
Prior	642		777
Revolving Loans	2,283		2,137
Revolving Loans Converted to Term	1,679		941
Total loans, net	5,891		5,920
Home equity | FICO Score, 660 to 719
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	23		334
Year two	248		273
Year three	167		86
Year four	56		84
Year five	53		66
Prior	327		402
Revolving Loans	1,071		985
Revolving Loans Converted to Term	872		625
Total loans, net	2,817		2,855
Home equity | FICO Score, Less Than 660
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	4		52
Year two	53		74
Year three	57		39
Year four	32		39
Year five	28		33
Prior	277		345
Revolving Loans	325		277
Revolving Loans Converted to Term	615		620
Total loans, net	1,391		1,479
Home equity | No FICO score available
Financing Receivable, Credit Quality Indicator [Line Items]
Year one			1
Year two	2		1
Year three	1		1
Year four	1		1
Year five	1		1
Prior	10		9
Revolving Loans	18		13
Revolving Loans Converted to Term	84		80
Total loans, net	117		107
Home equity | Greater than 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1		8
Year two	16		44
Year three	14		18
Year four	3		15
Year five	2		9
Prior	25		88
Revolving Loans	329		580
Revolving Loans Converted to Term	90		279
Total loans, net	480		1,041
Home equity | Greater than or equal to 80% to 100%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	7		517
Year two	85		320
Year three	62		59
Year four	13		42
Year five	11		25
Prior	66		158
Revolving Loans	990		1,781
Revolving Loans Converted to Term	674		591
Total loans, net	1,908		3,493
Home equity | Less than 80%
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	204		2,909
Year two	2,487		1,636
Year three	1,189		513
Year four	370		773
Year five	549		660
Prior	3,200		3,754
Revolving Loans	7,868		6,433
Revolving Loans Converted to Term	5,806		2,876
Total loans, net	$ 21,673		$ 19,554

[1] Our consolidated assets included the following for which we have elected the fair value option: Loans held for sale of $1.9 billion, Loans of $1.5 billion and Other assets of $0.1 billion at December 31, 2021 and Loans held for sale of $1.2 billion, Loans of $1.4 billion and Other assets of $0.1 billion at December 31, 2020.