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Loans - Schedule of Credit Quality Indicators for Term Loans by Origination Year (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross $ 115,557 $ 110,345
Percentage of total 100.00%  
Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross $ 99,170 90,636
Amortized cost [Member] | All Classes Except Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross $ 92,150  
Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total 34.00%  
Investment-Grade [Member] | All Classes Except Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross $ 31,487  
Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total 62.00%  
Non-Investment-Grade [Member] | All Classes Except Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross $ 57,168  
Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Percentage of total 4.00%  
Other/Unrated [Member] | All Classes Except Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross $ 3,495  
Corporate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans, gross 51,465 $ 46,307
Corporate [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 7,966  
2019 8,000  
2018 5,952  
2017 4,167  
2016 1,766  
2015 or earlier 2,672  
Revolving 17,060  
Loans, gross 47,583  
Corporate [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 2,355  
2019 995  
2018 2,155  
2017 891  
2016 271  
2015 or earlier 376  
Revolving 3,541  
Loans, gross 10,584  
Corporate [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 5,465  
2019 7,005  
2018 3,797  
2017 3,276  
2016 1,495  
2015 or earlier 2,296  
Revolving 13,428  
Loans, gross 36,762  
Corporate [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 146  
Revolving 91  
Loans, gross 237  
Wealth management [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 611  
2019 1,086  
2018 489  
2017 456  
2016 43  
2015 or earlier 784  
Revolving 18,330  
Loans, gross 21,799  
Wealth management [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 372  
2019 683  
2018 413  
2017 380  
2016 22  
2015 or earlier 519  
Revolving 15,338  
Loans, gross 17,727  
Wealth management [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 239  
2019 403  
2018 76  
2017 76  
2016 21  
2015 or earlier 265  
Revolving 1,851  
Loans, gross 2,931  
Wealth management [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Revolving 1,141  
Loans, gross 1,141  
Commercial real estate [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 2,800  
2019 2,120  
2018 2,399  
2017 1,809  
2016 195  
2015 or earlier 1,310  
Revolving 4,788  
Loans, gross 15,421  
Commercial real estate [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 538  
2019 24  
2018 213  
2017 18  
Revolving 127  
Loans, gross 920  
Commercial real estate [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 2,217  
2019 2,096  
2018 2,170  
2017 1,779  
2016 186  
2015 or earlier 819  
Revolving 4,661  
Loans, gross 13,928  
Commercial real estate [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 45  
2018 16  
2017 12  
2016 9  
2015 or earlier 491  
Loans, gross 573  
Residential real estate [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 1,683  
2019 483  
2018 512  
2017 145  
2016 2  
2015 or earlier 84  
Revolving 1,327  
Loans, gross 4,236  
Residential real estate [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 530  
2017 8  
Revolving 150  
Loans, gross 688  
Residential real estate [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 1,063  
2019 227  
2018 143  
2017 62  
2016 2  
Revolving 1,177  
Loans, gross 2,674  
Residential real estate [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 90  
2019 256  
2018 369  
2017 75  
2015 or earlier 84  
Loans, gross 874  
Other [Member] | Amortized cost [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 780  
2019 140  
2018 52  
2017 9  
Revolving 2,130  
Loans, gross 3,111  
Other [Member] | Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 260  
Revolving 1,308  
Loans, gross 1,568  
Other [Member] | Non-Investment-Grade [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 18  
2019 76  
2018 52  
2017 9  
Revolving 718  
Loans, gross 873  
Other [Member] | Other/Unrated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
2020 502  
2019 64  
Revolving 104  
Loans, gross $ 670