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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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