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Business Segments - Impacts of Changes to Internal Management Reporting (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense $ (121) $ (33) $ (1,072) $ 360
Total Assets 232,867 222,515 232,867 222,515
Group Reporting Basis Total deposits 139,779 103,964 139,779 103,964
Group Reporting Basis Goodwill 358 1,051 358 1,051
Operating Segments [Member] | WPB [Member]        
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense (229) (257) (1,164) (291)
Total Assets 56,728 52,334 56,728 52,334
Group Reporting Basis Total deposits 48,477 43,974 48,477 43,974
Group Reporting Basis Goodwill 0 693 0 693
Operating Segments [Member] | CMB [Member]        
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense 139 118 70 354
Total Assets 38,096 36,968 38,096 36,968
Group Reporting Basis Total deposits 39,736 25,975 39,736 25,975
Group Reporting Basis Goodwill 358 358 358 358
Operating Segments [Member] | GB&M [Member]        
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense 64 157 274 452
Total Assets 136,478 130,708 136,478 130,708
Group Reporting Basis Total deposits 51,566 34,015 51,566 34,015
Group Reporting Basis Goodwill 0 0 0 0
Operating Segments [Member] | CC [Member]        
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense (95) (51) (252) (155)
Total Assets 1,565 2,505 1,565 2,505
Group Reporting Basis Total deposits 0 0 0 0
Group Reporting Basis Goodwill $ 0 0 $ 0 0
As Previously Reported [Member] | Operating Segments [Member] | RBWM [Member]        
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense   (275)   (347)
Total Assets [1]   19,128   19,128
Group Reporting Basis Total deposits   34,877   34,877
Group Reporting Basis Goodwill   372   372
As Previously Reported [Member] | Operating Segments [Member] | CMB [Member]        
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense   111   332
Total Assets   27,734   27,734
Group Reporting Basis Total deposits   25,489   25,489
As Previously Reported [Member] | Operating Segments [Member] | GB&M [Member]        
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense   124   355
Total Assets   89,154   89,154
Group Reporting Basis Total deposits   32,002   32,002
As Previously Reported [Member] | Operating Segments [Member] | PB [Member]        
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense   0   (3)
Total Assets [1]   7,042   7,042
Group Reporting Basis Total deposits   7,720   7,720
Group Reporting Basis Goodwill   321   321
As Previously Reported [Member] | Operating Segments [Member] | CC [Member]        
Segment Reporting Information [Line Items]        
Profit (Loss) before Income Tax Expense   7   23
Total Assets   79,457   79,457
Group Reporting Basis Total deposits   $ 3,876   $ 3,876
[1] Segment total assets at September 30, 2019 included goodwill that was previously allocated to RBWM and PB of $372 million and $321 million, respectively.