Investments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Investment at fair value	$ 82,778	$ 57,827
Level 3 [Member]
Net gains / (losses) on assets	159	131
Level 3 [Member] \| Interest Income [Member]
Net gains / (losses) on assets	24	33
Investments [Member]
Investments in funds at NAV	3,664	4,206
Investment at fair value	79,114	53,621
Net gains / (losses) on assets	215	252
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date	(443)	1,295
Investments [Member] \| Operating income (loss) [Member]
Net gains / (losses) on assets	(428)	1,440
Investments [Member] \| Interest Income [Member]
Net gains / (losses) on assets	200	108
Investments [Member] \| Level 3 [Member]
Investment at fair value	16,423	15,282
Net gains / (losses) on assets	(228)	1,550
Equity Securities [Member]
Equity method investment	7,140	8,230
Equity Securities [Member] \| Investments [Member]
Investment at fair value	17,429	18,940
Net gains / (losses) on assets	68	160
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date	(252)	1,096
Equity Securities [Member] \| Investments [Member] \| Level 3 [Member]
Investment at fair value	9,642	10,903
Fair Value Option [Member]
Gains/(losses) recognized on equity securities	573	1,290
Investments in funds at NAV [Member]
Investments in funds at NAV	2,350	3,220
Investment at fair value	$ 1,310	$ 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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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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