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Regulation and Capital Adequacy - Risk-based Capital (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Jan. 01, 2022
Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Impact of CECL transition   $ 1,110    
Preferred stock $ 10,703 $ 10,703    
Phase in of reduction to regulatory capital due to CECL adoption 25.00%      
Phased in amount of reduction to regulatory capital due to CECL adoption     $ 276  
Percent of increase in allowance for credit losses under FRBCECL transition relief   25.00%    
Deferred tax liabilities associated with goodwill $ 682 $ 675    
Deferred tax liabilities associated with identifiable intangible assets $ 246 $ 17    
Subordinated debt maturity period 5 years      
Jr subordinated debt included in Tier 2 capital   10.00%    
Jr subordinated debt phased out of regulatory capital   90.00%    
Standardized        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Common shareholders’ equity $ 108,587 $ 99,223    
Impact of CECL transition 829 1,105    
Deduction for goodwill (5,606) (3,610)    
Deduction for identifiable intangible assets (1,717) (401)    
Other adjustments (3,386) (63)    
CET1 capital 98,707 96,254   $ 81,641
Preferred stock 10,703 10,703    
Deduction for investments in covered funds (193) (189)    
Other adjustments (3) (2)    
Tier 1 capital 109,214 106,766   92,730
Qualifying subordinated debt 11,011 11,554    
Junior subordinated debt 0 94    
Allowance for credit losses 4,598 3,034    
Other adjustments (10) (46)    
Tier 2 capital 15,599 14,636   15,424
Total capital 124,813 121,402    
Advanced        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
CET1 capital 98,707 96,254   81,641
Tier 1 capital 109,214 106,766   92,730
Standardized Tier 2 capital 15,599 14,636    
Allowance for credit losses (4,598) (3,034)    
Other adjustments 1,554 449    
Tier 2 capital 12,555 12,051   $ 13,279
Total capital $ 121,769 $ 118,817