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Segment Reporting - Segment Revenue and Segment Profit (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Segment revenue $ 767 $ 781 $ 2,272 $ 2,376
Wages and benefits 404 433 1,238 1,326
Services and supplies 194 187 546 568
Rent lease and maintenance expense 66 65 199 190
Other operating expense 1 2 10 10
Depreciation and amortization expense 40 35 119 119
Segment expenses 705 722 2,112 2,213
Income (Loss) Before Income Taxes 62 59 160 163
Commercial        
Segment Reporting Information [Line Items]        
Segment revenue 367 385 1,134 1,192
Wages and benefits 247 265 761 810
Services and supplies 47 49 155 158
Rent lease and maintenance expense 36 37 112 107
Other operating expense 0 0 3 2
Depreciation and amortization expense 20 19 63 67
Segment expenses 350 370 1,094 1,144
Income (Loss) Before Income Taxes 17 15 40 48
Government        
Segment Reporting Information [Line Items]        
Segment revenue 238 255 692 758
Wages and benefits 96 107 290 322
Services and supplies 63 72 188 219
Rent lease and maintenance expense 18 16 51 49
Other operating expense 0 0 4 4
Depreciation and amortization expense 13 10 34 34
Segment expenses 190 205 567 628
Income (Loss) Before Income Taxes 48 50 125 130
Transportation        
Segment Reporting Information [Line Items]        
Segment revenue 162 141 446 426
Wages and benefits 61 61 187 194
Services and supplies 84 66 203 191
Rent lease and maintenance expense 12 12 36 34
Other operating expense 1 2 3 4
Depreciation and amortization expense 7 6 22 18
Segment expenses 165 147 451 441
Income (Loss) Before Income Taxes $ (3) $ (6) $ (5) $ (15)