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Business Segments - Impacts of Changes to Internal Management Reporting (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense $ 325 $ (998)
Total Assets 219,949 269,609
Group Reporting Basis Total deposits 141,139 124,315
WPB [Member]    
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense 11 (869)
Total Assets 63,747 58,246
Group Reporting Basis Total deposits 49,578 48,800
CMB [Member]    
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense 144 (2)
Total Assets 44,170 42,882
Group Reporting Basis Total deposits 42,874 32,844
GB&M [Member]    
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense 191 45
Total Assets 110,524 165,838
Group Reporting Basis Total deposits 48,687 42,671
CC [Member]    
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense (21) (172)
Total Assets 1,508 2,643
Group Reporting Basis Total deposits $ 0 0
As Previously Reported [Member] | RBWM [Member]    
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense   (546)
Total Assets   18,954
Group Reporting Basis Total deposits   39,083
As Previously Reported [Member] | CMB [Member]    
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense   (3)
Total Assets   31,540
Group Reporting Basis Total deposits   32,309
As Previously Reported [Member] | GB&M [Member]    
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense   43
Total Assets   114,802
Group Reporting Basis Total deposits   40,417
As Previously Reported [Member] | PB [Member]    
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense   (323)
Total Assets   7,159
Group Reporting Basis Total deposits   8,201
As Previously Reported [Member] | CC [Member]    
Segment Reporting Information [Line Items]    
Profit (Loss) before Income Tax Expense   (169)
Total Assets   97,154
Group Reporting Basis Total deposits   $ 4,305