v3.21.2
Investments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Investments in funds at NAV $ 3,920   $ 3,920    
Investment at fair value 80,969   80,969   $ 82,778
Level 3 [Member]          
Net gains / (losses) on assets 7 $ 99 41 $ 94  
Level 3 [Member] | Interest Income [Member]          
Net gains / (losses) on assets 14 13 26 24  
Investments [Member]          
Investments in funds at NAV 3,917   3,917   3,664
Investment at fair value 77,052   77,052   79,114
Net gains / (losses) on assets 78 128 184 238  
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date 155 534 1,244 (808)  
Investments [Member] | Operating income (loss) [Member]          
Net gains / (losses) on assets 183 584 1,290 (737)  
Investments [Member] | Interest Income [Member]          
Net gains / (losses) on assets 50 78 135 167  
Investments [Member] | Level 3 [Member]          
Investment at fair value 13,679   13,679   16,423
Net gains / (losses) on assets 233 662 1,430 (570)  
Equity Securities [Member]          
Equity method investment 5,420   5,420   7,140
Equity Securities [Member] | Investments [Member]          
Investment at fair value 16,969   16,969   17,429
Net gains / (losses) on assets 29 64 (4) 81  
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date 118 373 916 (448)  
Equity Securities [Member] | Investments [Member] | Level 3 [Member]          
Investment at fair value 7,927   7,927   9,642
Fair Value Option [Member]          
Gains/(losses) recognized on equity securities 177 $ 101 1,810 $ 277  
Investments in funds at NAV [Member]          
Investments in funds at NAV 2,370   2,370   2,350
Investment at fair value 1,550   1,550   $ 1,310
Covered funds [Member]          
Investments in Volcker Covered funds $ 1,630   $ 1,630