Investment Securities - Components of Gains and Losses (Realized and Unrealized) on Investment Securities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Gain (Loss) on Securities [Line Items]
Gains on non-marketable and other equity securities, net	$ 730	$ 360	$ 139
Non-marketable securities
Gain (Loss) on Securities [Line Items]
Less: Realized net losses on the sales and OTTI of non-marketable and other equity securities	(85)	(24)	(5)
Net gains on non-marketable and other equity securities still held	645	336	134
Non-marketable securities | Consolidated venture capital and private equity fund investments | Fair value accounting
Gain (Loss) on Securities [Line Items]
Gains on non-marketable and other equity securities, net	71	32	23
Non-marketable securities | Consolidated venture capital and private equity fund investments | Equity method accounting
Gain (Loss) on Securities [Line Items]
Gains on non-marketable and other equity securities, net	474	162	74
Non-marketable securities | Unconsolidated venture capital and private equity fund investments | Fair value accounting
Gain (Loss) on Securities [Line Items]
Gains on non-marketable and other equity securities, net	75	60	31
Non-marketable securities | Other investments | Fair value accounting
Gain (Loss) on Securities [Line Items]
Gains on non-marketable and other equity securities, net	75	0	3
Non-marketable securities | Other investments | Equity method accounting
Gain (Loss) on Securities [Line Items]
Gains on non-marketable and other equity securities, net	10	1	(1)
Non-marketable securities | Debt funds | Equity method accounting
Gain (Loss) on Securities [Line Items]
Gains on non-marketable and other equity securities, net	2	0	1
Other equity securities | Fair value accounting
Gain (Loss) on Securities [Line Items]
Gains on non-marketable and other equity securities, net	$ 23	$ 105	$ 8