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Leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Operating Lease, Lease Income | $ 9,028 |  |
Lessee, Lease, Description [Line Items] |  |  |
Vehicle Lease Charges | $ 255 | $ 253 | $ 222
Supplemental balance sheet information related to leases [Line Items] |  |  |
Document Period End Date | Dec. 31, 2019 |  |
Operating Lease, Residual Value of Leased Asset | $ 314 |  |
Operating Lease, Right-of-Use Asset | 2,596 | 0 |
Operating Lease, Liability, Current | 479 | 0 |
Operating Lease, Liability, Noncurrent | 2,140 | $ 0 |
Americas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Lease, Lease Income | 6,303 |  |
EMEA [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Lease, Lease Income | 2,141 |  |
Asia and Australasia [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Lease, Lease Income | 584 |  |
Avis [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Lease, Lease Income | 5,163 |  |
Budget [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Lease, Lease Income | 3,129 |  |
Other Brands [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Operating Lease, Lease Income | 736 |  |
Property leases [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Operating Lease, Cost | 722 |  |
Variable Lease, Cost | 274 |  |
Sublease Income | (8) |  |
Lease, Cost | $ 988 |  |
Supplemental balance sheet information related to leases [Line Items] |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 8 years 10 months 24 days |  |
Operating Lease, Right-of-Use Asset | $ 2,596 |  |
Operating Lease, Liability, Noncurrent | 2,140 |  |
Operating Lease, Liability | $ 2,619 |  |
Operating Lease, Weighted Average Discount Rate, Percent | 4.31% |  |
Supplemental cash flow information related to leases [Line Items] |  |  |
Operating Lease, Payments | $ 733 |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 531 |  |
Maturities of lease liabilities [Line Items] |  |  |
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months | 580 |  |
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two | 470 |  |
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three | 400 |  |
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four | 348 |  |
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five | 230 |  |
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five | 1,174 |  |
Lessee, Operating Lease, Liability, Payments, Due | 3,202 |  |
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 583 |  |
Vehicle leases [Member] |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Lease, Cost | 301 |  |
Finance Lease, Right-of-Use Asset, Amortization | 42 |  |
Finance Lease, Interest Expense | $ 4 |  |
Supplemental balance sheet information related to leases [Line Items] |  |  |
Operating Lease, Weighted Average Remaining Lease Term | 1 year 9 months 18 days |  |
Operating Lease, Right-of-Use Asset | $ 195 |  |
Operating Lease, Liability, Current | 124 |  |
Operating Lease, Liability, Noncurrent | 71 |  |
Operating Lease, Liability | $ 195 |  |
Operating Lease, Weighted Average Discount Rate, Percent | 3.08% |  |
Finance Lease, Right-of-Use Asset, Gross | $ 337 |  |
Finance Lease, Right-of-Use Asset, Accumulated Amortization | (56) |  |
Finance Lease, Right-of-Use Asset | 281 |  |
Finance Lease, Liability, Current | 95 |  |
Finance Lease, Liability, Noncurrent | 157 |  |
Finance Lease, Liability | $ 252 |  |
Finance Lease, Weighted Average Remaining Lease Term | 2 years |  |
Finance Lease, Weighted Average Discount Rate, Percent | 1.67% |  |
Supplemental cash flow information related to leases [Line Items] |  |  |
Operating Lease, Payments | $ 248 |  |
Finance Lease, Interest Payment on Liability | 4 |  |
Finance Lease, Principal Payments | 266 |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 262 |  |
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability | 304 |  |
Maturities of lease liabilities [Line Items] |  |  |
Lessee, Operating Lease, Liability, Payments, Due Next Rolling Twelve Months | 128 |  |
Finance Lease, Liability, Payments, Due in Next Rolling Twelve Months | 95 |  |
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Two | 51 |  |
Finance Lease, Liability, Payments, Due in Rolling Year Two | 29 |  |
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Three | 17 |  |
Finance Lease, Liability, Payments, Due in Rolling Year Three | 127 |  |
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Four | 5 |  |
Finance Lease, Liability, Payments, Due in Rolling Year Four | 1 |  |
Lessee, Operating Lease, Liability, Payments, Due in Rolling Year Five | 0 |  |
Finance Lease, Liability, Payments, Due in Rolling Year Five | 0 |  |
Lessee, Operating Lease, Liability, Payments, Due after Rolling Year Five | 0 |  |
Finance Lease, Liability, Payments, Due in Rolling after Year Five | 0 |  |
Lessee, Operating Lease, Liability, Payments, Due | 201 |  |
Finance Lease, Liability, Payment, Due | 252 |  |
Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 6 |  |
Finance Lease, Liability, Undiscounted Excess Amount | $ 0 |  |

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on a rolling approach, from latest statement of financial position date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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