Commitments and Contingencies (Details) $ in Millions |
Sep. 30, 2026
USD ($)
|
|---|---|
| Boardwalk Pipelines | Capital Addition Purchase Commitments | |
| Commitments and Contingencies [Abstract] | |
| Purchase commitment, remaining minimum amount committed | $ 606 |
| Loews Hotels & Co | Financial Guarantee | |
| Commitments and Contingencies [Abstract] | |
| Potential amount of future payments under guarantees | 300 |
| CNA Financial | |
| Commitments and Contingencies [Abstract] | |
| Potential amount of future payments under guarantees | $ 1,800 |