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Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property leases |  |  |
Cash payments for lease liabilities within operating activities: |  |  |
Operating leases | $ 838 | $ 743 | $ 639
Non-cash activities - increase in ROU assets in exchange for lease liabilities: |  |  |
Operating leases | 1,079 | 812 | 484
Buses and support vehicles |  |  |
Cash payments for lease liabilities within operating activities: |  |  |
Operating leases | 167 | 137 | 162
Vehicle finance leases | 6 | 3 | 4
Cash payments for lease liabilities within financing activities: |  |  |
Vehicle finance leases | 105 | 181 | 193
Non-cash activities - increase in ROU assets in exchange for lease liabilities: |  |  |
Operating leases | 191 | 161 | 115
Vehicle finance leases | $ 118 | $ 153 | $ 223

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