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Loans - Commercial Banking: Risk Profile by Geographic Region and Internal Risk Rating (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 244,460 $ 245,899 $ 236,124
PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 33 135  
Commercial Banking      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 71,992 70,333  
Commercial Banking | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 31 130  
Commercial Banking | Geographic concentration risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 71,992 $ 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 $ 71,992 $ 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 $ 29,861 $ 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 $ 29,861 $ 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 $ 29,861 $ 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 $ 42,125 $ 41,091  
Commercial Banking | Commercial and industrial | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment 9 108  
Commercial Banking | Commercial and industrial | Geographic concentration risk      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 42,125 $ 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 $ 42,125 $ 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 $ 6 $ 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 $ 6 $ 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 $ 6 $ 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 $ 23,480 $ 23,348  
Percentage of portfolio 32.60% 33.20%  
Commercial Banking | Loans receivable | Geographic concentration risk | Mid-Atlantic      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 8,368 $ 8,132  
Percentage of portfolio 11.60% 11.60%  
Commercial Banking | Loans receivable | Geographic concentration risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 20,000 $ 19,634  
Percentage of portfolio 27.80% 27.90%  
Commercial Banking | Loans receivable | Geographic concentration risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 20,144 $ 19,219  
Percentage of portfolio 28.00% 27.30%  
Commercial Banking | Loans receivable | Internal risk rating | PCI loans      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 31 $ 130  
Percentage of portfolio 0.00% 0.20%  
Commercial Banking | Loans receivable | Internal risk rating | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 69,390 $ 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 $ 2,211 $ 1,848  
Percentage of portfolio 3.10% 2.60%  
Commercial Banking | Loans receivable | Internal risk rating | Criticized | Criticized nonperforming      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 360 $ 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 $ 15,954 $ 15,562  
Percentage of portfolio 53.40% 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 $ 3,308 $ 3,410  
Percentage of portfolio 11.10% 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 $ 4,675 $ 4,247  
Percentage of portfolio 15.70% 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 $ 5,924 $ 5,680  
Percentage of portfolio 19.80% 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 $ 28,991 $ 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 $ 805 $ 555  
Percentage of portfolio 2.70% 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 $ 43 $ 83  
Percentage of portfolio 0.10% 0.30%  
Commercial Banking | Loans receivable | Commercial and industrial | Geographic concentration risk | Northeast      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 7,522 $ 7,573  
Percentage of portfolio 17.90% 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 $ 5,060 $ 4,710  
Percentage of portfolio 12.00% 11.50%  
Commercial Banking | Loans receivable | Commercial and industrial | Geographic concentration risk | South      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 15,325 $ 15,367  
Percentage of portfolio 36.30% 37.40%  
Commercial Banking | Loans receivable | Commercial and industrial | Geographic concentration risk | Other      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 14,218 $ 13,441  
Percentage of portfolio 33.80% 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 $ 9 $ 108  
Percentage of portfolio 0.00% 0.30%  
Commercial Banking | Loans receivable | Commercial and industrial | Internal risk rating | Noncriticized      
Loans and Leases Receivable Disclosure [Line Items]      
Loans held for investment $ 40,399 $ 39,468  
Percentage of portfolio 96.00% 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 $ 1,406 $ 1,292  
Percentage of portfolio 3.30% 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 $ 311 $ 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 $ 4 $ 213  
Percentage of portfolio 66.70% 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 $ 0 $ 20  
Percentage of portfolio 0.00% 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 33.30% 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 $ 6 $ 6  
Percentage of portfolio 100.00% 1.70%