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Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property |  |  |
Cash payments for lease liabilities within operating activities: |  |  |
Operating leases | $ 639 | $ 740 | $ 733
Non-cash activities - increase (decrease) in ROU assets in exchange for lease liabilities: |  |  |
Operating leases | 484 | 666 | 531
Buses and support vehicles |  |  |
Cash payments for lease liabilities within operating activities: |  |  |
Operating leases | 162 | 196 | 248
Vehicle finance leases | 4 | 3 | 4
Cash payments for lease liabilities within financing activities: |  |  |
Vehicle finance leases | 193 | 294 | 266
Non-cash activities - increase (decrease) in ROU assets in exchange for lease liabilities: |  |  |
Operating leases | 115 | 111 | 262
Vehicle finance leases | $ 223 | $ 257 | $ 304

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- Definition Amount of interest paid on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977 + Details
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- Definition Amount of cash outflow for principal payment on finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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