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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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