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Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property leases |  |  |
Cash payments for lease liabilities within operating activities: |  |  |
Operating leases | $ 947 | $ 838 | $ 743
Non-cash activities - increase in ROU assets in exchange for lease liabilities: |  |  |
Operating leases | 1,404 | 1,079 | 812
Buses and support vehicles |  |  |
Cash payments for lease liabilities within operating activities: |  |  |
Operating leases | 151 | 167 | 137
Vehicle finance leases | 7 | 6 | 3
Cash payments for lease liabilities within financing activities: |  |  |
Vehicle finance leases | 105 | 105 | 181
Non-cash activities - increase in ROU assets in exchange for lease liabilities: |  |  |
Operating leases | 112 | 191 | 161
Vehicle finance leases | $ 102 | $ 118 | $ 153

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