Fair Value Option - Summary of DVA Gains/(Losses) on Financial Liabilities (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Option, Quantitative Disclosures [Line Items]
After tax DVA	$ 673	$ 67	$ 2,601	$ 165
Other Financial Liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Pre-tax DVA	907	92	3,488	222
After tax DVA	$ 673	$ 67	$ 2,601	$ 165