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Income Taxes - Schedule Of Deferred Tax Assets And Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Compensation and benefits, including postretirement benefits $ 181 $ 218
Accruals, including casualty and other claims 92 93
Other 188 198
Total gross deferred tax assets 461 509
Less valuation allowance (60) (57)
Net deferred tax assets 401 452
Deferred tax liabilities:    
Property (7,016) (6,820)
Other (550) (554)
Total deferred tax liabilities (7,566) (7,374)
Deferred income taxes $ (7,165) $ (6,922)