XML 117 R93.htm IDEA: XBRL DOCUMENT v3.22.0.1
Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 $ 182 $ 212 $ 213
Expenses 20 27 22
Other Accounts [1] 80 81 131
Deductions [2] 116 138 154
Ending Balance 166 182 212
Casualty and Other Claims Included in Other Liabilities      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Beginning Balance 169 171 158
Expenses [3] 77 80 89
Other Accounts 0 0 0
Deductions [4] 76 82 76
Ending Balance $ 170 $ 169 $ 171
[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.