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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 $ 166 $ 182 $ 212
Expenses 43 20 27
Other Accounts  [1] 88 80 81
Deductions [2] 127 116 138
Ending Balance 170 166 182
Casualty and Other Claims Included in Other Liabilities      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance 170 169 171
Expenses [3] 147 77 80
Other Accounts  0 0 0
Deductions [4] 99 76 82
Ending Balance $ 218 $ 170 $ 169
[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.