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Regulation and Capital Adequacy - Risk-based Capital (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Preferred stock $ 11,203 $ 11,203  
Standardized Capital Rules [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Common shareholders' equity 81,447 79,062  
Impact of CECL transition 1,100    
Deduction for goodwill (3,644) (3,529)  
Deduction for identifiable intangible assets (599) (604)  
Other adjustments (801) (79)  
CET1 capital 77,503 74,850 $ 73,116
Preferred stock 11,203 11,203  
Deduction for investments in covered funds (129) (610)  
Other adjustments (11) (3)  
Tier 1 capital 88,566 85,440 83,702
Qualifying subordinated debt 12,872 12,847  
Junior subordinated debt 188 284  
Allowance for credit losses 3,019 1,802  
Other adjustments (61) (8)  
Tier 2 capital 16,018 14,925 14,926
Total capital 104,584 100,365  
Advanced Capital [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
CET1 capital 77,503 74,850 73,116
Tier 1 capital 88,566 85,440 83,702
Standardized Tier 2 capital 16,018 14,925  
Allowance for credit losses (3,019) (1,802)  
Other adjustments 1,068 350  
Tier 2 capital 14,067 13,473 $ 13,743
Total capital $ 102,633 $ 98,913