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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Disaggregation of Revenue [Table Text Block]
The following table presents the Company’s revenues disaggregated by geography.
Year Ended December 31,
 20202019
Americas$3,965 $6,352 
Europe, Middle East and Africa1,127 2,222 
Asia and Australasia310 598 
Total revenues$5,402 $9,172 

The following table presents the Company’s revenues disaggregated by brand.
Year Ended December 31,
 20202019
Avis$2,961 $5,250 
Budget1,908 3,179 
Other533 743 
Total revenues$5,402 $9,172 
________
Other includes Zipcar and other operating brands.
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
The following table presents changes in deferred revenue associated with the Company’s customer loyalty program.

Year Ended December 31,
20202019
Balance, January 1$59 $64 
Revenue deferred26 17 
Revenue recognized(51)(22)
Balance, December 31$34 $59 
_______
At December 31, 2020 and 2019, $17 million and $22 million was included in accounts payable and other current liabilities, respectively, and $17 million and $37 million, respectively, in other non-current liabilities. Non-current amounts are expected to be recognized as revenue within two to three years.
Cash and Cash Equivalents, Program Cash and Restricted Cash [Table Text Block] The following table provides a detail of cash and cash equivalents, program and restricted cash reported within the Consolidated Balance Sheets to the amounts shown in the Consolidated Statements of Cash Flows: 
As of December 31,
20202019
Cash and cash equivalents$692 $686 
Program cash72 211 
Restricted cash (a)
1 3 
Total cash and cash equivalents, program and restricted cash$765 $900 
_________
(a)Included within other current assets.
Schedule of Estimated Useful Lives Useful lives are as follows:
Buildings30 years
Furniture, fixtures & equipment3 to 10 years
Capitalized software3 to 7 years
Buses and support vehicles4 to 15 years