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Loans - Schedule of Credit Quality Indicators for Term Loans by Origination Year (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross $ 131,321 $ 110,345
Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross 114,335 90,636
Amortized cost [Member] | All Classes Except Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross 107,428  
Investment-Grade [Member] | All Classes Except Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross 40,637  
Non-Investment-Grade [Member] | All Classes Except Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross 64,397  
Other/Unrated [Member] | All Classes Except Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross 2,394  
Corporate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross 68,530 $ 46,307
Corporate [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 3,673  
2019 9,747  
2018 6,660  
2017 4,860  
2016 1,791  
2015 or earlier 3,083  
Revolving 33,883  
Loans, gross 63,697  
Corporate [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 1,151  
2019 1,648  
2018 2,383  
2017 883  
2016 165  
2015 or earlier 435  
Revolving 11,617  
Loans, gross 18,282  
Corporate [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 2,522  
2019 8,081  
2018 4,277  
2017 3,977  
2016 1,626  
2015 or earlier 2,648  
Revolving 22,240  
Loans, gross 45,371  
Corporate [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2019 18  
Revolving 26  
Loans, gross 44  
Wealth management [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 217  
2019 930  
2018 483  
2017 475  
2016 95  
2015 or earlier 748  
Revolving 18,235  
Loans, gross 21,183  
Wealth management [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 172  
2019 532  
2018 393  
2017 400  
2016 30  
2015 or earlier 540  
Revolving 16,663  
Loans, gross 18,730  
Wealth management [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 45  
2019 398  
2018 90  
2017 75  
2016 65  
2015 or earlier 208  
Revolving 1,557  
Loans, gross 2,438  
Wealth management [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Revolving 15  
Loans, gross 15  
Commercial real estate [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 696  
2019 1,954  
2018 2,698  
2017 1,761  
2016 192  
2015 or earlier 1,280  
Revolving 5,584  
Loans, gross 14,165  
Commercial real estate [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2019 57  
2018 195  
2017 18  
Loans, gross 270  
Commercial real estate [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 632  
2019 1,870  
2018 2,484  
2017 1,718  
2016 180  
2015 or earlier 589  
Revolving 5,584  
Loans, gross 13,057  
Commercial real estate [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 64  
2019 27  
2018 19  
2017 25  
2016 12  
2015 or earlier 691  
Loans, gross 838  
Residential real estate [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 110  
2019 958  
2018 485  
2017 443  
2016 524  
2015 or earlier 70  
Revolving 1,321  
Loans, gross 3,911  
Residential real estate [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2017 179  
Revolving 79  
Loans, gross 258  
Residential real estate [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 92  
2019 707  
2018 169  
2017 95  
2016 524  
Revolving 1,242  
Loans, gross 2,829  
Residential real estate [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 18  
2019 251  
2018 316  
2017 169  
2015 or earlier 70  
Loans, gross 824  
Installment and Credit Cards [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 723  
2019 2,043  
2018 1,686  
2017 355  
2016 19  
Revolving 2,081  
Loans, gross 6,907  
Other [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 502  
2019 102  
2018 66  
2017 24  
2016 1  
2015 or earlier 3,777  
Loans, gross 4,472  
Other [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2015 or earlier 3,097  
Loans, gross 3,097  
Other [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 22  
2019 45  
2018 53  
2017 19  
2016 1  
2015 or earlier 562  
Loans, gross 702  
Other [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 480  
2019 57  
2018 13  
2017 5  
2015 or earlier 118  
Loans, gross $ 673