v3.21.2
Investments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Investments in funds at NAV $ 3,990   $ 3,990    
Investment at fair value 85,021   85,021   $ 82,778
Level 3 [Member]          
Net gains / (losses) on assets 43 $ 26 36 $ (16)  
Level 3 [Member] | Interest Income [Member]          
Net gains / (losses) on assets 11 11 17 19  
Investments [Member]          
Investments in funds at NAV 3,988   3,988   3,664
Investment at fair value 81,033   81,033   79,114
Net gains / (losses) on assets 85 40 245 121  
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date 1,106 (135) 1,894 (1,395)  
Investments [Member] | Operating income (loss) [Member]          
Net gains / (losses) on assets 1,120 (170) 2,020 (1,410)  
Investments [Member] | Interest Income [Member]          
Net gains / (losses) on assets 66 75 116 132  
Investments [Member] | Level 3 [Member]          
Investment at fair value 16,332   16,332   16,423
Net gains / (losses) on assets 1,190 (95) 2,140 (1,270)  
Equity Securities [Member]          
Equity method investment 6,230   6,230   7,140
Equity Securities [Member] | Investments [Member]          
Investment at fair value 18,547   18,547   17,429
Net gains / (losses) on assets 43 2 83 19  
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date 888 (143) 1,561 (902)  
Equity Securities [Member] | Investments [Member] | Level 3 [Member]          
Investment at fair value 9,755   9,755   9,642
Fair Value Option [Member]          
Gains/(losses) recognized on equity securities 1,220 $ 99 1,640 $ 176  
Investments in funds at NAV [Member]          
Investments in funds at NAV 2,500   2,500   2,350
Investment at fair value 1,490   1,490   $ 1,310
Covered funds [Member]          
Investments in Volcker Covered funds $ 1,650   $ 1,650