v3.26.1
Master Trust - Fair Value Measurements (Details) - Rail - Master Trust - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
EBP, Master Trust [Line Items]    
Investments, at fair value $ 21,737,110 $ 17,558,746
Stocks    
EBP, Master Trust [Line Items]    
Investments, at fair value 9,440,963 7,161,141
Corporate bonds and notes    
EBP, Master Trust [Line Items]    
Investments, at fair value 1,121,988 906,725
U.S. government securities    
EBP, Master Trust [Line Items]    
Investments, at fair value 917,546 847,015
Common collective trusts    
EBP, Master Trust [Line Items]    
Investments, at fair value 10,071,355 8,473,155
Registered investment companies    
EBP, Master Trust [Line Items]    
Investments, at fair value 24,181 8,351
Other investments, net    
EBP, Master Trust [Line Items]    
Investments, at fair value 161,077 162,359
Level 1    
EBP, Master Trust [Line Items]    
Investments, at fair value 9,574,541 7,283,800
Level 1 | Stocks    
EBP, Master Trust [Line Items]    
Investments, at fair value 9,428,200 7,158,198
Level 1 | Corporate bonds and notes    
EBP, Master Trust [Line Items]    
Investments, at fair value 0 0
Level 1 | U.S. government securities    
EBP, Master Trust [Line Items]    
Investments, at fair value 0 0
Level 1 | Common collective trusts    
EBP, Master Trust [Line Items]    
Investments, at fair value 0 0
Level 1 | Registered investment companies    
EBP, Master Trust [Line Items]    
Investments, at fair value 24,181 8,351
Level 1 | Other investments, net    
EBP, Master Trust [Line Items]    
Investments, at fair value 122,160 117,251
Level 2    
EBP, Master Trust [Line Items]    
Investments, at fair value 2,091,214 1,801,791
Level 2 | Stocks    
EBP, Master Trust [Line Items]    
Investments, at fair value 12,763 2,943
Level 2 | Corporate bonds and notes    
EBP, Master Trust [Line Items]    
Investments, at fair value 1,121,988 906,725
Level 2 | U.S. government securities    
EBP, Master Trust [Line Items]    
Investments, at fair value 917,546 847,015
Level 2 | Common collective trusts    
EBP, Master Trust [Line Items]    
Investments, at fair value 0 0
Level 2 | Registered investment companies    
EBP, Master Trust [Line Items]    
Investments, at fair value 0 0
Level 2 | Other investments, net    
EBP, Master Trust [Line Items]    
Investments, at fair value 38,917 45,108
Measured at NAV    
EBP, Master Trust [Line Items]    
Investments, at fair value 10,071,355 8,473,155
Measured at NAV | Stocks    
EBP, Master Trust [Line Items]    
Investments, at fair value 0 0
Measured at NAV | Corporate bonds and notes    
EBP, Master Trust [Line Items]    
Investments, at fair value 0 0
Measured at NAV | U.S. government securities    
EBP, Master Trust [Line Items]    
Investments, at fair value 0 0
Measured at NAV | Common collective trusts    
EBP, Master Trust [Line Items]    
Investments, at fair value 10,071,355 8,473,155
Measured at NAV | Registered investment companies    
EBP, Master Trust [Line Items]    
Investments, at fair value 0 0
Measured at NAV | Other investments, net    
EBP, Master Trust [Line Items]    
Investments, at fair value $ 0 $ 0