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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current Portion of Casualty and Other Claims Included in Accounts Payable      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance $ 170 $ 166 $ 182
Expenses 51 43 20
Other Accounts  [1] 84 88 80
Deductions [2] (119) 127 116
Ending Balance 186 170 166
Casualty and Other Claims Included in Other Liabilities      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance 218 170 169
Expenses [3] 153 147 77
Other Accounts  0 0 0
Deductions [4] (150) 99 76
Ending Balance $ 221 $ 218 $ 170
[1] Includes revenue refunds and overcharges provided through deductions from operating revenues and transfers  
from other accounts.
[2] Payments and reclassifications to/from accounts payable.
[3] Includes adjustments for changes in estimates for prior years’ claims.
[4] Payments and reclassifications to/from other liabilities.