Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	12 Months Ended
	Jan. 13, 2023	Jan. 05, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Equity [Line Items]
Common stock, shares authorized (in shares)				4,000,000,000	4,000,000,000
Authorized shares of nonvoting common shares (in shares)				200,000,000	200,000,000
Common stock, par value (in dollars per share)				$ 0.01	$ 0.01
Nonvoting common stock, par value (in dollars per share)				$ 0.01	$ 0.01
Shares remitted by employees to satisfy minimum statutory employee tax withholding (in shares)				11,644	1,830	3,476
Total value of shares remitted				$ 4.0	$ 0.5	$ 0.9
Amount of share-based awards cancelled to satisfy minimum statutory employee tax withholding requirements (in shares)				4,600,000	3,400,000	3,400,000
Value of share-based awards cancelled to satisfy minimum statutory employee tax withholding requirements				$ 1,590.0	$ 984.0	$ 829.0
Dividends declared per common share (in dollars per share)				$ 9.00	$ 6.50	$ 5.00
Redemption value				$ 10,703.0
Date of dividends declared on preferred shares				Jan. 05, 2023
GreenSky, Inc
Equity [Line Items]
Number of shares issued (in shares)			5,500,000
Number of shares issue or issuable subject to future service (in shares)			325,000
Subsequent Event
Equity [Line Items]
Dividends declared per common share (in dollars per share)	$ 2.50
Series N Preferred Stock
Equity [Line Items]
Dividend rate					6.30%
Redemption value					$ 675.0
Redemption price per share (in dollars per share)					$ 25,000
Preferred stock dividends declared (in dollars per share)				$ 0	$ 787.50	1,575
Series M Preferred Stock
Equity [Line Items]
Dividend rate					5.375%
Redemption value					$ 2,000.0
Redemption price per share (in dollars per share)					$ 25,000
Difference between the redemption value of Preferred Stock and the net carrying value at the time of redemption					$ 41.0
Preferred stock dividends declared (in dollars per share)				0	$ 0	$ 1,217.16
Series L Preferred Stock
Equity [Line Items]
Dividend rate						5.70%
Redemption value						$ 350.0
Redemption price per share (in dollars per share)						$ 25,000
Difference between the redemption value of Preferred Stock and the net carrying value at the time of redemption						$ 1.0
Shares redeemed during the period (in shares)						14,000
Preferred stock dividends declared (in dollars per share)				$ 0	0	$ 361.54
Series A Preferred Stock
Equity [Line Items]
Redemption value				$ 750.0
Preferred stock dividends declared (in dollars per share)				$ 950.51	950.51	947.92
Series A Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		$ 341.29
Series C Preferred Stock
Equity [Line Items]
Redemption value				$ 200.0
Preferred stock dividends declared (in dollars per share)				$ 1,013.9	1,013.9	1,011.12
Series C Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		341.29
Series D Preferred Stock
Equity [Line Items]
Redemption value				$ 1,350.0
Preferred stock dividends declared (in dollars per share)				$ 1,013.9	1,013.9	1,011.12
Series D Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		336.18
Series J Preferred Stock
Equity [Line Items]
Redemption value				$ 1,000.0
Preferred stock dividends declared (in dollars per share)				$ 1,375	1,375	1,375
Series J Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		343.75
Series K Preferred Stock
Equity [Line Items]
Redemption value				$ 700.0
Preferred stock dividends declared (in dollars per share)				$ 1,593.76	1,593.76	1,593.76
Series K Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		398.44
Series Q Preferred Stock
Equity [Line Items]
Redemption value				$ 500.0
Preferred stock dividends declared (in dollars per share)				$ 1,375	1,375	1,577.43
Series Q Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		687.50
Series R Preferred Stock
Equity [Line Items]
Redemption value				$ 600.0
Preferred stock dividends declared (in dollars per share)				$ 1,237.5	1,237.5	910.94
Series R Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		618.75
Series S Preferred Stock
Equity [Line Items]
Redemption value				$ 350.0
Preferred stock dividends declared (in dollars per share)				$ 1,100	1,100	586.67
Series S Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		550.00
Series U Preferred Stock
Equity [Line Items]
Redemption value				$ 750.0
Preferred stock dividends declared (in dollars per share)				$ 942.92	0	0
Series U Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		456.25
Series E Preferred Stock
Equity [Line Items]
Redemption value				$ 767.0
Preferred stock dividends declared (in dollars per share)				$ 4,055.55	4,055.55	4,055.55
Series E Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		1,382.02
Series F Preferred Stock
Equity [Line Items]
Redemption value				$ 161.0
Preferred stock dividends declared (in dollars per share)				$ 4,055.55	4,055.55	4,055.55
Series F Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		1,382.64
Series O Preferred Stock
Equity [Line Items]
Redemption value				$ 650.0
Preferred stock dividends declared (in dollars per share)				$ 1,325	1,325	1,325
Series P Preferred Stock
Equity [Line Items]
Redemption value				$ 1,500.0
Preferred stock dividends declared (in dollars per share)				$ 1,250	1,250	1,250
Series P Preferred Stock | Subsequent Event | Group Inc.
Equity [Line Items]
Preferred stock dividends declared (in dollars per share)		$ 476.99
Series T Preferred Stock
Equity [Line Items]
Redemption value				$ 675.0
Preferred stock dividends declared (in dollars per share)				$ 950.00	511.94	0
Series V Preferred Stock
Equity [Line Items]
Redemption value				$ 750.0
Preferred stock dividends declared (in dollars per share)				$ 1,062.76	$ 0	$ 0