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Acquisitions - Schedule of Unaudited Proforma Financial Information (Details) - Cardinal Portfolio acquisition - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Asset Acquisition [Line Items] |  |  |  |
Operating revenues | $ 481 | $ 409 | $ 846 | $ 722
Net income (loss) | $ 30 | $ 13 | $ (44) | $ (93)

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