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Investments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Debt and Equity Securities, FV-NI [Line Items]          
Investments in credit funds measured at NAV $ 77,580   $ 77,580   $ 83,427
Gross unrealized loss included in accumulated other comprehensive gain/(loss)     3,890   779
Gross unrealized gain included in accumulated other comprehensive gain/(loss)     0   118
Net unrealized losses included in other comprehensive income/(loss after tax 615 $ 114 2,410 $ 658  
Held-to-maturity securities, gross unrealized gains 0   0   175
Held-to-maturity securities, gross unrealized losses 1,530   1,530   0
Available-for-sale Securities          
Debt and Equity Securities, FV-NI [Line Items]          
Net unrealized losses included in other comprehensive income/(loss before tax 836 152 3,230 880  
Net unrealized losses included in other comprehensive income/(loss after tax 615 114 2,410 658  
Level 3          
Debt and Equity Securities, FV-NI [Line Items]          
Net realized gains/(losses) (72) 7 (128) 41  
Investments          
Debt and Equity Securities, FV-NI [Line Items]          
Investments in funds at NAV 2,971   2,971   3,469
Investments in credit funds measured at NAV 74,609   74,609   79,958
Net realized gains/(losses) 103 78 428 184  
Net unrealized gains / (losses) on level 3 investments (407) 155 (1,828) 1,244  
Investments | Operating income (loss)          
Debt and Equity Securities, FV-NI [Line Items]          
Net realized gains/(losses) (427) 183 (1,710) 1,290  
Investments | Interest income          
Debt and Equity Securities, FV-NI [Line Items]          
Net realized gains/(losses) 123 50 314 135  
Investments | Level 3          
Debt and Equity Securities, FV-NI [Line Items]          
Investments in credit funds measured at NAV 16,954   16,954   13,902
Net realized gains/(losses) (304) 233 (1,400) 1,430  
Equity securities          
Debt and Equity Securities, FV-NI [Line Items]          
Equity method investment 5,070   5,070   5,810
Equity securities | Investments          
Debt and Equity Securities, FV-NI [Line Items]          
Investments in credit funds measured at NAV 14,034   14,034   17,138
Net realized gains/(losses) 24 29 174 (4)  
Net unrealized gains / (losses) on level 3 investments (205) 118 (1,236) 916  
Equity securities | Investments | Level 3          
Debt and Equity Securities, FV-NI [Line Items]          
Investments in credit funds measured at NAV 9,020   9,020   7,915
Fair value option          
Debt and Equity Securities, FV-NI [Line Items]          
Gains/(losses) recognized on equity securities (118) $ 177 (189) $ 1,810  
Investments in funds at NAV          
Debt and Equity Securities, FV-NI [Line Items]          
Investments in funds at NAV 1,330   1,330   1,800
Investments in credit funds measured at NAV 1,640   1,640   $ 1,670
Covered funds          
Debt and Equity Securities, FV-NI [Line Items]          
Investments in Volcker covered funds $ 400   $ 400