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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenues [Abstract] |  |  |  |
Total revenues from contracts with customers | $ 683 | $ 537 | $ 2,104 | $ 1,660
Other revenues | 23 | 22 | 74 | 68
Operating revenues and other | 706 | 559 | 2,178 | 1,728
CNA Financial | Non-insurance warranty |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Total revenues from contracts with customers | 401 | 407 | 1,212 | 1,221
Boardwalk Pipelines | Transportation and storage of natural gas and NGLs and other services |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Total revenues from contracts with customers | 463 | 347 | 1,431 | 1,083
Loews Hotels & Co | Lodging and related services |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Total revenues from contracts with customers | $ 220 | $ 190 | $ 673 | $ 577

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