Investments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Investment at fair value	$ 74,714		$ 74,714		$ 57,827
Level 3 [Member]
Net gains / (losses) on assets	99	$ 9	94	$ 89
Level 3 [Member] \| Interest Income [Member]
Net gains / (losses) on assets	13	16	24	33
Investments [Member]
Investments in funds at NAV	3,517		3,517		4,206
Investment at fair value	71,197		71,197		53,621
Net gains / (losses) on assets	128	46	238	119
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date	534	137	(808)	684
Investments [Member] \| Operating income (loss) [Member]
Net gains / (losses) on assets	584	146	(737)	687
Investments [Member] \| Interest Income [Member]
Net gains / (losses) on assets	78	37	167	116
Investments [Member] \| Level 3 [Member]
Investment at fair value	17,274		17,274		15,282
Net gains / (losses) on assets	662	183	570	803
Equity Securities [Member]
Equity method investment	6,720		6,720		8,230
Equity Securities [Member] \| Investments [Member]
Investment at fair value	16,805		16,805		18,940
Net gains / (losses) on assets	64	22	81	53
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date	373	121	(448)	569
Equity Securities [Member] \| Investments [Member] \| Level 3 [Member]
Investment at fair value	10,038		10,038		10,903
Fair Value Option [Member]
Gains/(losses) recognized on equity securities	101	$ 256	277	$ 711
Investments in funds at NAV [Member]
Investments in funds at NAV	2,300		2,300		3,220
Investment at fair value	$ 1,220		$ 1,220		$ 983

Fair value of investment other than investment in equity security, investment in debt security and equity method investment. Includes, but is not limited to, investment in certain entities that calculate net asset value per share. Example includes, but is not limited to, investment in hedge fund, venture capital fund, private equity fund, and real estate partnership or fund.

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Fair value portion of investments accounted under the equity method.

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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