Investments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Investment at fair value	$ 62,655		$ 57,827
Level 3 [Member]
Net gains / (losses) on assets	27	$ 27
Level 3 [Member] \| Interest Income [Member]
Net gains / (losses) on assets	17	14
Investments [Member]
Investments in funds at NAV	3,545		4,206
Investment at fair value	59,110		53,621
Net gains / (losses) on assets	75	35
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date	(1,284)	239
Investments [Member] \| Operating income (loss) [Member]
Net gains / (losses) on assets	(1,290)	227
Investments [Member] \| Interest Income [Member]
Net gains / (losses) on assets	77	47
Investments [Member] \| Level 3 [Member]
Investment at fair value	19,408		15,282
Net gains / (losses) on assets	(1,210)	274
Equity Securities [Member]
Equity method investment	8,040		8,230
Equity Securities [Member] \| Investments [Member]
Investment at fair value	18,516		18,940
Net gains / (losses) on assets	17	22
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date	(766)	182
Equity Securities [Member] \| Investments [Member] \| Level 3 [Member]
Investment at fair value	11,056		10,903
Fair Value Option [Member]
Gains/(losses) recognized on equity securities	77	$ 165
Investments in funds at NAV [Member]
Investments in funds at NAV	2,710		3,220
Investment at fair value	$ 840		$ 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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- Definition

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

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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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