Other Liabilities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Other Liabilities Disclosure [Line Items]
Operating lease costs	$ 124,000,000	$ 111,000,000	$ 362,000,000	$ 348,000,000
Lease payments related to operating lease arrangements not yet commenced	1,100,000,000		1,100,000,000
Liabilities held for sale	680,000,000		680,000,000		$ 0
Contract liabilities	112,000,000		112,000,000		$ 113,000,000
Platform Solutions | GreenSky
Other Liabilities Disclosure [Line Items]
Liabilities held for sale	270,000,000		270,000,000
Asset management
Other Liabilities Disclosure [Line Items]
Liabilities held for sale	$ 410,000,000		$ 410,000,000