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Shareholders' Equity - Components of Company's Regulatory Capital (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Less intangible assets    
Qualifying preferred stock $ 5,501 $ 5,501
Basel III Transitional Standardized Approach: [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common shareholders' equity 41,797 40,630
Less intangible assets    
Goodwill (net of deferred tax liability) (8,203) (8,295)
Other disallowed intangible assets (427) (335)
Other 553 612
Total common equity tier 1 capital 33,720 32,612
Qualifying preferred stock 5,501 5,501
Noncontrolling interests eligible for tier 1 capital 203 318
Other (3)  
Total tier 1 capital 39,421 38,431
Eligible portion of allowance for credit losses 4,357 4,255
Subordinated debt and noncontrolling interests eligible for tier 2 capital 3,576 2,616
Other 1 11
Total tier 2 capital 7,934 6,882
Total risk-based capital 47,355 45,313
Risk-weighted assets 358,237 341,360
Basel III transitional advanced approaches: [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common shareholders' equity 41,797 40,630
Less intangible assets    
Goodwill (net of deferred tax liability) (8,203) (8,295)
Other disallowed intangible assets (427) (335)
Other 553 612
Total common equity tier 1 capital 33,720 32,612
Qualifying preferred stock 5,501 5,501
Noncontrolling interests eligible for tier 1 capital 203 318
Other (3)  
Total tier 1 capital 39,421 38,431
Eligible portion of allowance for credit losses 1,266 1,204
Subordinated debt and noncontrolling interests eligible for tier 2 capital 3,576 2,616
Other 1 11
Total tier 2 capital 4,843 3,831
Total risk-based capital 44,264 42,262
Risk-weighted assets $ 277,141 $ 261,668