Loans and Related Allowance for Credit Losses, Loans by Loan to Value Ratio, Consumer (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
High value properties, threshold		$ 1
By LTV/CLTV:
Total	[1]	1,009,843	$ 962,265
Purchase credit deteriorated [Member]
By LTV/CLTV:
Total			568
Total Consumer [Member]
By LTV/CLTV:
Term loans by origination year, 2020		21,555
Term loans by origination year, 2019		82,693
Term loans by origination year, 2018		36,793
Term loans by origination year, 2017		43,712
Term loans by origination year, 2016		48,161
Term loans by origination year, Prior		115,472
Revolving loans		83,479
Revolving loans converted to term loans		10,243
Total		442,108	446,546
Total Consumer [Member] | Not purchased credit deteriorated [Member]
By LTV/CLTV:
Total			445,978
Total Consumer [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]
By LTV/CLTV:
Total			11,170
Total Consumer [Member] | Purchase credit deteriorated [Member]
By LTV/CLTV:
Total			568
Total Consumer [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]
By LTV/CLTV:
Total			$ 568
Total Consumer [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV greater than 80% [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, percent of debt-to-value ratio			9.00%
Residential mortgage [Member]
By LTV/CLTV:
Term loans by origination year, 2020		14,264
Term loans by origination year, 2019		59,188
Term loans by origination year, 2018		25,292
Term loans by origination year, 2017		36,560
Term loans by origination year, 2016		41,750
Term loans by origination year, Prior		107,298
Revolving loans		27,391
Revolving loans converted to term loans		9,704
Total		321,447	$ 323,356
Residential mortgage [Member] | Not purchased credit deteriorated [Member]
By LTV/CLTV:
Total			322,788
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 0-60% [Member]
By LTV/CLTV:
Total			166,081
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 60.01-80% [Member]
By LTV/CLTV:
Total			124,458
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 80.01-100% [Member]
By LTV/CLTV:
Total			17,441
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 100.01-120% [Member]
By LTV/CLTV:
Total			1,838
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV greater than 120% [Member]
By LTV/CLTV:
Total			674
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | No LTV/CLTV available [Member]
By LTV/CLTV:
Total			1,126
Residential mortgage [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]
By LTV/CLTV:
Total			11,170
Residential mortgage [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]
By LTV/CLTV:
Total			568
Real estate 1-4 family first mortgage [Member]
By LTV/CLTV:
Term loans by origination year, 2020		14,256
Term loans by origination year, 2019		59,144
Term loans by origination year, 2018		25,241
Term loans by origination year, 2017		36,511
Term loans by origination year, 2016		41,709
Term loans by origination year, Prior		105,728
Revolving loans		8,063
Revolving loans converted to term loans		2,268
Total		292,920	293,847
Real estate 1-4 family first mortgage [Member] | Non-government insured/guaranteed [Member] | LTV 0-60% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		4,143
Term loans by origination year, 2019		16,842
Term loans by origination year, 2018		8,032
Term loans by origination year, 2017		14,961
Term loans by origination year, 2016		22,878
Term loans by origination year, Prior		76,122
Revolving loans		5,503
Revolving loans converted to term loans		1,644
Total		150,125
Real estate 1-4 family first mortgage [Member] | Non-government insured/guaranteed [Member] | LTV 60.01-80% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		9,526
Term loans by origination year, 2019		34,239
Term loans by origination year, 2018		14,133
Term loans by origination year, 2017		19,674
Term loans by origination year, 2016		17,326
Term loans by origination year, Prior		17,228
Revolving loans		1,672
Revolving loans converted to term loans		401
Total		114,199
Real estate 1-4 family first mortgage [Member] | Non-government insured/guaranteed [Member] | LTV 80.01-100% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		544
Term loans by origination year, 2019		7,791
Term loans by origination year, 2018		2,714
Term loans by origination year, 2017		1,412
Term loans by origination year, 2016		814
Term loans by origination year, Prior		1,757
Revolving loans		585
Revolving loans converted to term loans		155
Total		15,772
Real estate 1-4 family first mortgage [Member] | Non-government insured/guaranteed [Member] | LTV 100.01-120% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		0
Term loans by origination year, 2019		80
Term loans by origination year, 2018		96
Term loans by origination year, 2017		86
Term loans by origination year, 2016		72
Term loans by origination year, Prior		310
Revolving loans		169
Revolving loans converted to term loans		39
Total		852
Real estate 1-4 family first mortgage [Member] | Non-government insured/guaranteed [Member] | LTV greater than 120% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		0
Term loans by origination year, 2019		47
Term loans by origination year, 2018		29
Term loans by origination year, 2017		27
Term loans by origination year, 2016		29
Term loans by origination year, Prior		124
Revolving loans		71
Revolving loans converted to term loans		14
Total		341
Real estate 1-4 family first mortgage [Member] | Non-government insured/guaranteed [Member] | No LTV/CLTV available [Member]
By LTV/CLTV:
Term loans by origination year, 2020		42
Term loans by origination year, 2019		113
Term loans by origination year, 2018		87
Term loans by origination year, 2017		80
Term loans by origination year, 2016		92
Term loans by origination year, Prior		300
Revolving loans		63
Revolving loans converted to term loans		15
Total		792
Real estate 1-4 family first mortgage [Member] | Government insured or guaranteed [Member]
By LTV/CLTV:
Term loans by origination year, 2020		1
Term loans by origination year, 2019		32
Term loans by origination year, 2018		150
Term loans by origination year, 2017		271
Term loans by origination year, 2016		498
Term loans by origination year, Prior		9,887
Revolving loans		0
Revolving loans converted to term loans		0
Total		10,839
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member]
By LTV/CLTV:
Total			293,292
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 0-60% [Member]
By LTV/CLTV:
Total			151,478
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 60.01-80% [Member]
By LTV/CLTV:
Total			114,795
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 80.01-100% [Member]
By LTV/CLTV:
Total			13,867
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 100.01-120% [Member]
By LTV/CLTV:
Total			860
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV greater than 120% [Member]
By LTV/CLTV:
Total			338
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | No LTV/CLTV available [Member]
By LTV/CLTV:
Total			784
Real estate 1-4 family first mortgage [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]
By LTV/CLTV:
Total			11,170
Real estate 1-4 family first mortgage [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]
By LTV/CLTV:
Total			555
Real estate 1-4 family junior lien mortgage [Member]
By LTV/CLTV:
Term loans by origination year, 2020		8
Term loans by origination year, 2019		44
Term loans by origination year, 2018		51
Term loans by origination year, 2017		49
Term loans by origination year, 2016		41
Term loans by origination year, Prior		1,570
Revolving loans		19,328
Revolving loans converted to term loans		7,436
Total		28,527	29,509
Real estate 1-4 family junior lien mortgage [Member] | Non-government insured/guaranteed [Member] | LTV 0-60% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		0
Term loans by origination year, 2019		0
Term loans by origination year, 2018		0
Term loans by origination year, 2017		0
Term loans by origination year, 2016		0
Term loans by origination year, Prior		634
Revolving loans		9,526
Revolving loans converted to term loans		4,023
Total		14,183
Real estate 1-4 family junior lien mortgage [Member] | Non-government insured/guaranteed [Member] | LTV 60.01-80% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		0
Term loans by origination year, 2019		0
Term loans by origination year, 2018		0
Term loans by origination year, 2017		0
Term loans by origination year, 2016		0
Term loans by origination year, Prior		450
Revolving loans		6,827
Revolving loans converted to term loans		2,055
Total		9,332
Real estate 1-4 family junior lien mortgage [Member] | Non-government insured/guaranteed [Member] | LTV 80.01-100% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		0
Term loans by origination year, 2019		0
Term loans by origination year, 2018		0
Term loans by origination year, 2017		0
Term loans by origination year, 2016		0
Term loans by origination year, Prior		290
Revolving loans		2,165
Revolving loans converted to term loans		971
Total		3,426
Real estate 1-4 family junior lien mortgage [Member] | Non-government insured/guaranteed [Member] | LTV 100.01-120% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		0
Term loans by origination year, 2019		0
Term loans by origination year, 2018		0
Term loans by origination year, 2017		0
Term loans by origination year, 2016		0
Term loans by origination year, Prior		102
Revolving loans		566
Revolving loans converted to term loans		262
Total		930
Real estate 1-4 family junior lien mortgage [Member] | Non-government insured/guaranteed [Member] | LTV greater than 120% [Member]
By LTV/CLTV:
Term loans by origination year, 2020		0
Term loans by origination year, 2019		0
Term loans by origination year, 2018		0
Term loans by origination year, 2017		0
Term loans by origination year, 2016		0
Term loans by origination year, Prior		33
Revolving loans		216
Revolving loans converted to term loans		80
Total		329
Real estate 1-4 family junior lien mortgage [Member] | Non-government insured/guaranteed [Member] | No LTV/CLTV available [Member]
By LTV/CLTV:
Term loans by origination year, 2020		8
Term loans by origination year, 2019		44
Term loans by origination year, 2018		51
Term loans by origination year, 2017		49
Term loans by origination year, 2016		41
Term loans by origination year, Prior		61
Revolving loans		28
Revolving loans converted to term loans		45
Total		$ 327
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member]
By LTV/CLTV:
Total			29,496
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 0-60% [Member]
By LTV/CLTV:
Total			14,603
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 60.01-80% [Member]
By LTV/CLTV:
Total			9,663
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 80.01-100% [Member]
By LTV/CLTV:
Total			3,574
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV 100.01-120% [Member]
By LTV/CLTV:
Total			978
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | LTV greater than 120% [Member]
By LTV/CLTV:
Total			336
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member] | Non-government insured/guaranteed [Member] | No LTV/CLTV available [Member]
By LTV/CLTV:
Total			342
Real estate 1-4 family junior lien mortgage [Member] | Not purchased credit deteriorated [Member] | Government insured or guaranteed [Member]
By LTV/CLTV:
Total			0
Real estate 1-4 family junior lien mortgage [Member] | Purchase credit deteriorated [Member] | Non-government insured/guaranteed [Member]
By LTV/CLTV:
Total			$ 13

[1] (2) Parenthetical amounts represent assets and liabilities that we are required to carry at fair value or have elected the fair value option.