v3.20.4
Regulation and Capital Adequacy - Risk-based Capital (Detail) - USD ($)
$ in Millions
Dec. 31, 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 84,729 79,062  
Impact of CECL transition 1,126    
Deduction for goodwill (3,652) (3,529)  
Deduction for identifiable intangible assets (601) (604)  
Other adjustments 39 (79)  
CET1 capital 81,641 74,850 $ 73,116
Preferred stock 11,203 11,203  
Deduction for investments in covered funds (106) (610)  
Other adjustments (8) (3)  
Tier 1 capital 92,730 85,440 83,702
Qualifying subordinated debt 12,196 12,847  
Junior subordinated debt 188 284  
Allowance for credit losses 3,095 1,802  
Other adjustments (55) (8)  
Tier 2 capital 15,424 14,925 14,926
Total capital 108,154 100,365  
Advanced Capital Rules [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
CET1 capital 81,641 74,850 73,116
Tier 1 capital 92,730 85,440 83,702
Standardized Tier 2 capital 15,424 14,925  
Allowance for credit losses (3,095) (1,802)  
Other adjustments 950 350  
Tier 2 capital 13,279 13,473 $ 13,743
Total capital $ 106,009 $ 98,913