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Investments - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Investment at fair value $ 57,827 $ 45,579
Level 3 [Member]    
Net gains / (losses) on assets 131 146
Level 3 [Member] | Interest Income [Member]    
Net gains / (losses) on assets 33 94
Investments [Member]    
Investments in funds at NAV 4,206 3,936
Investment at fair value 53,621 41,643
Net realized gains / (losses) 252 237
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date 1,295 834
Investments [Member] | Operating income (loss) [Member]    
Net gains / (losses) on assets 1,440 848
Investments [Member] | Interest Income [Member]    
Net gains / (losses) on assets 108 223
Investments [Member] | Level 3 [Member]    
Investment at fair value 15,282 13,548
Net gains / (losses) on assets 1,550 1,070
Equity Securities [Member]    
Equity method investment 8,230 7,910
Equity Securities [Member] | Investments [Member]    
Investment at fair value 18,940 18,042
Net realized gains / (losses) 160 155
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date 1,096 775
Equity Securities [Member] | Investments [Member] | Level 3 [Member]    
Investment at fair value 10,903 10,335
Fair Value Option [Member]    
Gains/(losses) recognized on equity securities 1,290 1,410
Investments in funds at NAV [Member]    
Investments in funds at NAV 3,220 3,390
Investment at fair value $ 983 $ 548