Shareholders' Equity - Issued and Outstanding Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Millions		7 Months Ended	12 Months Ended
	Aug. 01, 2024	Jul. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			10,215,000	10,490,000
Preferred stock, shares outstanding (in shares)			10,215,000	10,490,000
Carrying Value			$ 2,394	$ 2,011
Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			0	350,000
Preferred stock, shares outstanding (in shares)			0	350,000
Preferred stock, liquidation preference per share (in USD per share)			$ 1,000
Preferred stock dividend rate (as a percent)			0.00%
Carrying Value			$ 0	$ 350
Preferred stock, dividends declared (in USD per share)			$ 62.58	$ 64.50	$ 64.50
Series F Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			50,000	50,000
Preferred stock, shares outstanding (in shares)			50,000	50,000
Preferred stock, liquidation preference per share (in USD per share)			$ 10,000
Preferred stock dividend rate (as a percent)			5.125%	5.125%
Carrying Value			$ 500	$ 500
Preferred stock, dividends declared (in USD per share)			$ 512.50	$ 512.50	512.50
Series G Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			40,000	40,000
Preferred stock, shares outstanding (in shares)			40,000	40,000
Preferred stock, liquidation preference per share (in USD per share)			$ 10,000
Preferred stock dividend rate (as a percent)	7.304%	5.00%	7.304%	5.00%
Carrying Value			$ 400	$ 400
Preferred stock, dividends declared (in USD per share)			$ 556.16	$ 500.00	$ 500.00
Series H Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			10,000,000	10,000,000
Preferred stock, shares outstanding (in shares)			10,000,000	10,000,000
Preferred stock, liquidation preference per share (in USD per share)			$ 25
Preferred stock dividend rate (as a percent)			5.625%	5.625%	5.625%
Carrying Value			$ 261	$ 261
Preferred stock, dividends declared (in USD per share)			$ 1.41	$ 1.41	$ 1.05
Series I Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			50,000	50,000
Preferred stock, shares outstanding (in shares)			50,000	50,000
Preferred stock, liquidation preference per share (in USD per share)			$ 10,000
Preferred stock dividend rate (as a percent)			3.50%	3.50%
Carrying Value			$ 500	$ 500
Preferred stock, dividends declared (in USD per share)			$ 350.00	$ 350.00	356.81
Series J Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)			75,000	0
Preferred stock, shares outstanding (in shares)			75,000	0
Preferred stock, liquidation preference per share (in USD per share)			$ 10,000
Preferred stock dividend rate (as a percent)			7.50%	7.50%
Carrying Value			$ 733	$ 0
Preferred stock, dividends declared (in USD per share)			$ 441.67	$ 0	$ 0