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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenues [Abstract] |  |  |  |
Total revenues from contracts with customers | $ 732 | $ 683 | $ 2,347 | $ 2,104
Other revenues | 27 | 23 | 79 | 74
Operating revenues and other | 759 | 706 | 2,426 | 2,178
CNA Financial | Non-insurance warranty |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Total revenues from contracts with customers | 393 | 401 | 1,188 | 1,212
Boardwalk Pipelines | Transportation and storage of natural gas and NGLs and other services |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Total revenues from contracts with customers | 530 | 463 | 1,662 | 1,431
Loews Hotels & Co | Lodging and related services |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Total revenues from contracts with customers | $ 202 | $ 220 | $ 685 | $ 673

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