Shareholders' Equity - Issued and Outstanding Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Millions	Jun. 30, 2024	May 13, 2024	Dec. 31, 2023
Class of Stock [Line Items]
Carrying Value	$ 2,744		$ 2,011
Preferred Series E
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 1,000		$ 1,000
Preferred stock, shares issued (in shares)	350,000		350,000
Preferred stock, shares outstanding (in shares)	350,000		350,000
Carrying Value	$ 350		$ 350
Preferred stock outstanding (in USD)	$ 350		$ 350
Preferred Series F
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000		$ 10,000
Preferred stock, shares issued (in shares)	50,000		50,000
Preferred stock, shares outstanding (in shares)	50,000		50,000
Carrying Value	$ 500		$ 500
Preferred stock outstanding (in USD)	$ 500		$ 500
Preferred Series G
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000		$ 10,000
Preferred stock, shares issued (in shares)	40,000		40,000
Preferred stock, shares outstanding (in shares)	40,000		40,000
Carrying Value	$ 400		$ 400
Preferred stock outstanding (in USD)	$ 400		$ 400
Series H Preferred Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 25		$ 25
Preferred stock, shares issued (in shares)	10,000,000		10,000,000
Preferred stock, shares outstanding (in shares)	10,000,000		10,000,000
Carrying Value	$ 261		$ 261
Preferred stock outstanding (in USD)	$ 261		$ 261
Preferred Series I
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000		$ 10,000
Preferred stock, shares issued (in shares)	50,000		50,000
Preferred stock, shares outstanding (in shares)	50,000		50,000
Carrying Value	$ 500		$ 500
Preferred stock outstanding (in USD)	$ 500		$ 500
Series J Preferred Stock
Class of Stock [Line Items]
Preferred stock, liquidation preference per share (in USD per share)	$ 10,000	$ 10,000	$ 10,000
Preferred stock, shares issued (in shares)	75,000		0
Preferred stock, shares outstanding (in shares)	75,000		0
Carrying Value	$ 733		$ 0
Preferred stock outstanding (in USD)	$ 733		$ 0