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Loans - Commercial Banking: Risk Profile by Geographic Region and Internal Risk Rating (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 240,273 $ 245,899 $ 248,256
PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 126 135  
Commercial Banking      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 71,189 70,333  
Commercial Banking | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 123 130  
Commercial Banking | Geographic concentration risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 71,189 $ 70,333  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Internal risk rating      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 71,189 $ 70,333  
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 $ 28,984 $ 28,899  
Commercial Banking | Commercial and multifamily real estate | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 22 22  
Commercial Banking | Commercial and multifamily real estate | Geographic concentration risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 28,984 $ 28,899  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Commercial and multifamily real estate | Internal risk rating      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 28,984 $ 28,899  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Commercial and industrial      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 42,197 $ 41,091  
Commercial Banking | Commercial and industrial | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 101 108  
Commercial Banking | Commercial and industrial | Geographic concentration risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 42,197 $ 41,091  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Commercial and industrial | Internal risk rating      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 42,197 $ 41,091  
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 $ 8 $ 343  
Commercial Banking | Small-ticket commercial real estate | PCI loans      
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 $ 8 $ 343  
Percentage of portfolio 100.00% 100.00%  
Commercial Banking | Small-ticket commercial real estate | Internal risk rating      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 8 $ 343  
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 $ 23,278 $ 23,348  
Percentage of portfolio 32.70% 33.20%  
Commercial Banking | Loans receivable | Geographic concentration risk | Mid-Atlantic      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 8,184 $ 8,132  
Percentage of portfolio 11.50% 11.60%  
Commercial Banking | Loans receivable | Geographic concentration risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 19,701 $ 19,634  
Percentage of portfolio 27.70% 27.90%  
Commercial Banking | Loans receivable | Geographic concentration risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 20,026 $ 19,219  
Percentage of portfolio 28.10% 27.30%  
Commercial Banking | Loans receivable | Internal risk rating | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 123 $ 130  
Percentage of portfolio 0.20% 0.20%  
Commercial Banking | Loans receivable | Internal risk rating | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 68,594 $ 68,043  
Percentage of portfolio 96.40% 96.80%  
Commercial Banking | Loans receivable | Internal risk rating | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2,094 $ 1,848  
Percentage of portfolio 2.90% 2.60%  
Commercial Banking | Loans receivable | Internal risk rating | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 378 $ 312  
Percentage of portfolio 0.50% 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 $ 15,559 $ 15,562  
Percentage of portfolio 53.60% 53.80%  
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 $ 3,366 $ 3,410  
Percentage of portfolio 11.60% 11.80%  
Commercial Banking | Loans receivable | Commercial and multifamily real estate | Geographic concentration risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,566 $ 4,247  
Percentage of portfolio 15.80% 14.70%  
Commercial Banking | Loans receivable | Commercial and multifamily real estate | Geographic concentration risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 5,493 $ 5,680  
Percentage of portfolio 19.00% 19.70%  
Commercial Banking | Loans receivable | Commercial and multifamily real estate | Internal risk rating | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 22 $ 22  
Percentage of portfolio 0.10% 0.10%  
Commercial Banking | Loans receivable | Commercial and multifamily real estate | Internal risk rating | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 28,148 $ 28,239  
Percentage of portfolio 97.10% 97.70%  
Commercial Banking | Loans receivable | Commercial and multifamily real estate | Internal risk rating | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 745 $ 555  
Percentage of portfolio 2.60% 1.90%  
Commercial Banking | Loans receivable | Commercial and multifamily real estate | Internal risk rating | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 69 $ 83  
Percentage of portfolio 0.20% 0.30%  
Commercial Banking | Loans receivable | Commercial and industrial | Geographic concentration risk | Northeast      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 7,714 $ 7,573  
Percentage of portfolio 18.30% 18.40%  
Commercial Banking | Loans receivable | Commercial and industrial | Geographic concentration risk | Mid-Atlantic      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 4,818 $ 4,710  
Percentage of portfolio 11.40% 11.50%  
Commercial Banking | Loans receivable | Commercial and industrial | Geographic concentration risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 15,134 $ 15,367  
Percentage of portfolio 35.90% 37.40%  
Commercial Banking | Loans receivable | Commercial and industrial | Geographic concentration risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 14,531 $ 13,441  
Percentage of portfolio 34.40% 32.70%  
Commercial Banking | Loans receivable | Commercial and industrial | Internal risk rating | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 101 $ 108  
Percentage of portfolio 0.20% 0.30%  
Commercial Banking | Loans receivable | Commercial and industrial | Internal risk rating | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 40,446 $ 39,468  
Percentage of portfolio 95.90% 96.10%  
Commercial Banking | Loans receivable | Commercial and industrial | Internal risk rating | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1,349 $ 1,292  
Percentage of portfolio 3.20% 3.10%  
Commercial Banking | Loans receivable | Commercial and industrial | Internal risk rating | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 301 $ 223  
Percentage of portfolio 0.70% 0.50%  
Commercial Banking | Loans receivable | Small-ticket commercial real estate | Geographic concentration risk | Northeast      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 5 $ 213  
Percentage of portfolio 62.50% 62.10%  
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 $ 0 $ 12  
Percentage of portfolio 0.00% 3.50%  
Commercial Banking | Loans receivable | Small-ticket commercial real estate | Geographic concentration risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 1 $ 20  
Percentage of portfolio 12.50% 5.80%  
Commercial Banking | Loans receivable | Small-ticket commercial real estate | Geographic concentration risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 2 $ 98  
Percentage of portfolio 25.00% 28.60%  
Commercial Banking | Loans receivable | Small-ticket commercial real estate | Internal risk rating | PCI loans      
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 | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 0 $ 336  
Percentage of portfolio 0.00% 98.00%  
Commercial Banking | Loans receivable | Small-ticket commercial real estate | Internal risk rating | Criticized | Criticized performing      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 0 $ 1  
Percentage of portfolio 0.00% 0.30%  
Commercial Banking | Loans receivable | Small-ticket commercial real estate | Internal risk rating | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 8 $ 6  
Percentage of portfolio 100.00% 1.70%