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Loans - Commercial Banking: Risk Profile by Geographic Region and Internal Risk Rating (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 245,899 $ 254,473 $ 245,586
Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 135 10,775  
Commercial Banking      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 70,333 64,575  
Commercial Banking | Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 130 480  
Commercial Banking | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 70,333 $ 64,575  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Internal Risk Rating Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 70,333 $ 64,575  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Commercial and multifamily real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 28,899 $ 26,150  
Commercial Banking | Commercial and multifamily real estate | Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 22 25  
Commercial Banking | Commercial and multifamily real estate | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 28,899 $ 26,150  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Commercial and multifamily real estate | Internal Risk Rating Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 28,899 $ 26,150  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Commercial and industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 41,091 $ 38,025  
Commercial Banking | Commercial and industrial | Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 108 455  
Commercial Banking | Commercial and industrial | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 41,091 $ 38,025  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Commercial and industrial | Internal Risk Rating Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 41,091 $ 38,025  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Small-ticket commercial real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 343 $ 400  
Commercial Banking | Small-ticket commercial real estate | Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 0 0  
Commercial Banking | Small-ticket commercial real estate | Geographic Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 343 $ 400  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Small-ticket commercial real estate | Internal Risk Rating Concentration Risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 343 $ 400  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Loans Receivable | Geographic Concentration Risk | Northeast      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 23,348 $ 22,993  
Percentage of portfolio 33.20% 35.70%  
Commercial Banking | Loans Receivable | Geographic Concentration Risk | Mid-Atlantic      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 8,132 $ 6,612  
Percentage of portfolio 11.60% 10.20%  
Commercial Banking | Loans Receivable | Geographic Concentration Risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 19,634 $ 18,480  
Percentage of portfolio 27.90% 28.60%  
Commercial Banking | Loans Receivable | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 19,219 $ 16,490  
Percentage of portfolio 27.30% 25.50%  
Commercial Banking | Loans Receivable | Internal Risk Rating Concentration Risk | Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 130 $ 480  
Percentage of portfolio 0.20% 0.80%  
Commercial Banking | Loans Receivable | Internal Risk Rating Concentration Risk | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 68,043 $ 61,162  
Percentage of portfolio 96.80% 94.70%  
Commercial Banking | Loans Receivable | Internal Risk Rating Concentration Risk | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,848 $ 2,649  
Percentage of portfolio 2.60% 4.10%  
Commercial Banking | Loans Receivable | Internal Risk Rating Concentration Risk | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 312 $ 284  
Percentage of portfolio 0.40% 0.40%  
Commercial Banking | Loans Receivable | Commercial and multifamily real estate | Geographic Concentration Risk | Northeast      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 15,562 $ 14,969  
Percentage of portfolio 53.80% 57.30%  
Commercial Banking | Loans Receivable | Commercial and multifamily real estate | Geographic Concentration Risk | Mid-Atlantic      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 3,410 $ 2,675  
Percentage of portfolio 11.80% 10.20%  
Commercial Banking | Loans Receivable | Commercial and multifamily real estate | Geographic Concentration Risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,247 $ 3,719  
Percentage of portfolio 14.70% 14.20%  
Commercial Banking | Loans Receivable | Commercial and multifamily real estate | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 5,680 $ 4,787  
Percentage of portfolio 19.70% 18.30%  
Commercial Banking | Loans Receivable | Commercial and multifamily real estate | Internal Risk Rating Concentration Risk | Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 22 $ 25  
Percentage of portfolio 0.10% 0.10%  
Commercial Banking | Loans Receivable | Commercial and multifamily real estate | Internal Risk Rating Concentration Risk | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 28,239 $ 25,609  
Percentage of portfolio 97.70% 98.00%  
Commercial Banking | Loans Receivable | Commercial and multifamily real estate | Internal Risk Rating Concentration Risk | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 555 $ 478  
Percentage of portfolio 1.90% 1.80%  
Commercial Banking | Loans Receivable | Commercial and multifamily real estate | Internal Risk Rating Concentration Risk | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 83 $ 38  
Percentage of portfolio 0.30% 0.10%  
Commercial Banking | Loans Receivable | Commercial and industrial | Geographic Concentration Risk | Northeast      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 7,573 $ 7,774  
Percentage of portfolio 18.40% 20.40%  
Commercial Banking | Loans Receivable | Commercial and industrial | Geographic Concentration Risk | Mid-Atlantic      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,710 $ 3,922  
Percentage of portfolio 11.50% 10.30%  
Commercial Banking | Loans Receivable | Commercial and industrial | Geographic Concentration Risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 15,367 $ 14,739  
Percentage of portfolio 37.40% 38.80%  
Commercial Banking | Loans Receivable | Commercial and industrial | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 13,441 $ 11,590  
Percentage of portfolio 32.70% 30.50%  
Commercial Banking | Loans Receivable | Commercial and industrial | Internal Risk Rating Concentration Risk | Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 108 $ 455  
Percentage of portfolio 0.30% 1.20%  
Commercial Banking | Loans Receivable | Commercial and industrial | Internal Risk Rating Concentration Risk | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 39,468 $ 35,161  
Percentage of portfolio 96.10% 92.50%  
Commercial Banking | Loans Receivable | Commercial and industrial | Internal Risk Rating Concentration Risk | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,292 $ 2,170  
Percentage of portfolio 3.10% 5.70%  
Commercial Banking | Loans Receivable | Commercial and industrial | Internal Risk Rating Concentration Risk | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 223 $ 239  
Percentage of portfolio 0.50% 0.60%  
Commercial Banking | Loans Receivable | Small-ticket commercial real estate | Geographic Concentration Risk | Northeast      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 213 $ 250  
Percentage of portfolio 62.10% 62.40%  
Commercial Banking | Loans Receivable | Small-ticket commercial real estate | Geographic Concentration Risk | Mid-Atlantic      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 12 $ 15  
Percentage of portfolio 3.50% 3.80%  
Commercial Banking | Loans Receivable | Small-ticket commercial real estate | Geographic Concentration Risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 20 $ 22  
Percentage of portfolio 5.80% 5.50%  
Commercial Banking | Loans Receivable | Small-ticket commercial real estate | Geographic Concentration Risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 98 $ 113  
Percentage of portfolio 28.60% 28.30%  
Commercial Banking | Loans Receivable | Small-ticket commercial real estate | Internal Risk Rating Concentration Risk | Financial Asset Acquired with Credit Deterioration [Member]      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 0 $ 0  
Percentage of portfolio 0.00% 0.00%  
Commercial Banking | Loans Receivable | Small-ticket commercial real estate | Internal Risk Rating Concentration Risk | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 336 $ 392  
Percentage of portfolio 98.00% 97.90%  
Commercial Banking | Loans Receivable | Small-ticket commercial real estate | Internal Risk Rating Concentration Risk | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1 $ 1  
Percentage of portfolio 0.30% 0.30%  
Commercial Banking | Loans Receivable | Small-ticket commercial real estate | Internal Risk Rating Concentration Risk | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 6 $ 7  
Percentage of portfolio 1.70% 1.80%