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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |
Asset acquisition, consideration transferred | $ 23 | $ 28 |
Goodwill | 1,108 | 1,137 | $ 1,101
Assets Acquisition 2019 |  |  |
Business Acquisition [Line Items] |  |  |
Asset acquisition, consideration transferred |  |  | $ 55
Acquired finite-lived intangible assets, weighted average useful life |  |  | 3 years
Payments to acquire businesses |  |  | $ 74
Goodwill |  |  | 21
Fleet |  |  |
Business Acquisition [Line Items] |  |  |
Property acquired | 22 | 22 |
Fleet | Assets Acquisition 2019 |  |  |
Business Acquisition [Line Items] |  |  |
Property acquired |  |  | 27
Franchise Rights |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets acquired | $ 28 | $ 28 |
Acquired finite-lived intangible assets, weighted average useful life | 1 year | 2 years |
License agreements | Assets Acquisition 2019 |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets acquired |  |  | 24
Other | Assets Acquisition 2019 |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived intangible assets acquired |  |  | $ 7

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- Definition Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123362884&loc=d3e9215-128498 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6829253&loc=SL6831962-166255 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123385561&loc=d3e9135-128495 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 50 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123362884&loc=d3e9212-128498 + Details
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