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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Billions
Jul. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Subsequent Event [Line Items]      
Common stock, par or stated value per share (in dollars per share)   $ 1.00 $ 1.00
Subsequent Event | Forecast      
Subsequent Event [Line Items]      
Common stock, par or stated value per share (in dollars per share) $ 1.00    
Subsequent Event | Union Pacific Merger      
Subsequent Event [Line Items]      
Specified termination fee $ 2.5    
Union Pacific | Subsequent Event | Union Pacific Merger | Forecast      
Subsequent Event [Line Items]      
Common stock, par or stated value per share (in dollars per share) $ 2.50    
Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Entity Shares Issued Per Acquiree Share 1    
Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Cash Paid Per Acquiree Share $ 88.82