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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

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