Fair Value Option - Gains and Losses on Other Financial Assets and Financial Liabilities at Fair Value (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value option gains/(losses)	$ 11,633	$ (3,544)	$ (3,161)
Unsecured short-term borrowings
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value option gains/(losses)	4,055	(1,016)	206
Unsecured long-term borrowings
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value option gains/(losses)	6,506	(2,393)	(2,804)
Other
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value option gains/(losses)	$ 1,072	$ (135)	$ (563)