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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenues [Abstract] |  |  |  |
Revenues from contracts with customers | $ 500 | $ 425 | $ 1,520 | $ 1,518
Other revenues | 33 | 25 | 87 | 62
Operating revenues and other | 533 | 450 | 1,607 | 1,580
Non-insurance warranty – CNA Financial | CNA Financial |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Revenues from contracts with customers | 399 | 357 | 1,173 | 1,054
Transportation and storage of natural gas and NGLs and other services – Boardwalk Pipelines | Transportation and storage of natural gas and NGLs and other services – Boardwalk Pipelines |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Revenues from contracts with customers | 329 | 296 | 1,013 | 959
Lodging and related services – Loews Hotels & Co | Lodging and related services – Loews Hotels & Co |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Revenues from contracts with customers | 171 | 129 | 507 | 279
Rigid plastic packaging and recycled resin - Corporate | Rigid plastic packaging and recycled resin - Corporate |  |  |  |
Disaggregation of Revenues [Abstract] |  |  |  |
Revenues from contracts with customers |  |  |  | $ 280

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