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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 15, 2027 | Oct. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, consideration received on transaction |  | $ 5,651 |  |  |  |
Dividends paid on mandatory convertible preferred stock |  |  | $ 86 | $ 244 |  |
Dividends, preferred stock |  |  | $ 87 |  |  |
Preferred stock, dividends per share, declared (in dollars per share) |  |  | $ 15.00 |  |  |
Forecast |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Equity instrument, convertible, threshold consecutive trading days | 20 days |  |  |  |  |
Equity instrument, convertible, threshold consecutive trading days trigger period | 21 days |  |  |  |  |
Depositary Share |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 115,000,000 |  |  |  |
Mandatory convertible preferred stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares, issued (in shares) |  | 5,750,000 | 5,750,000 | 5,750,000 |  | 5,750,000
Preferred stock, dividend rate, percentage |  | 6.00% |  | 6.00% |  | 6.00%
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 1.00 | $ 1.00 | $ 1.00 |  | $ 1.00
Mandatory convertible preferred stock | Forecast |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Conversion of stock, shares converted (in shares) | 5.8280 |  |  |  |  |
Mandatory convertible preferred stock | Minimum | Forecast |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Conversion of stock, shares converted (in shares) | 5.8280 |  |  |  |  |
Mandatory convertible preferred stock | Maximum | Forecast |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Conversion of stock, shares converted (in shares) | 6.9940 |  |  |  |  |

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