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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Supplemental Balance Sheet Information Related to Leases [Line Items] |  |
Operating lease ROU assets | $ 2,368 | $ 2,560
Short-term operating lease liabilities | 496 | 514
Long-term operating lease liabilities | $ 1,910 | $ 2,078
Weighted average discount rate | 1.25% | 1.16%
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Accounts Payable and Accrued Liabilities, Current | Accounts Payable and Accrued Liabilities, Current
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Vehicles, net | Vehicles, net
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Total | Total
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Operating lease ROU assets | Operating lease ROU assets
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Operating lease ROU assets | Operating lease ROU assets
Property |  |
Supplemental Balance Sheet Information Related to Leases [Line Items] |  |
Operating lease ROU assets | $ 2,368 | $ 2,560
Short-term operating lease liabilities | 496 | 514
Long-term operating lease liabilities | 1,910 | 2,078
Operating lease liabilities | $ 2,406 | $ 2,592
Weighted average remaining lease term | 8 years 9 months 18 days | 8 years 4 months 24 days
Weighted average discount rate | 3.84% | 3.86%
Buses and support vehicles |  |
Supplemental Balance Sheet Information Related to Leases [Line Items] |  |
Operating lease ROU assets | $ 63 | $ 113
Short-term operating lease liabilities | 50 | 82
Long-term operating lease liabilities | 14 | 31
Operating lease liabilities | $ 64 | $ 113
Weighted average remaining lease term | 1 year 3 months 18 days | 1 year 6 months
Weighted average discount rate | 2.66% | 2.90%
Finance lease ROU assets, gross | $ 353 | $ 304
Accumulated amortization | (72) | (42)
Finance Lease ROU assets, net | 281 | 262
Short-term vehicle finance lease liabilities | 126 | 86
Long-term vehicle finance lease liabilities | 116 | 140
Total | $ 242 | $ 226
Weighted average remaining lease term | 2 years 2 months 12 days | 1 year 9 months 18 days
Weighted average discount rate | 1.97% | 1.99%

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