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Business Combinations and Asset Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract]  
Business Combination
The allocation of total consideration to the fair values of the assets is as follows (in millions):
April 7,
2023
Property and equipment$1,571 
Materials and supplies10 
Goodwill532 
     Fair value of assets$2,113