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Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Statements Of Cash Flows) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Supplemental Guarantor Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | $ 447 | $ 472
Property and equipment additions | (42) | (40)
Proceeds received on asset sales | 2 | 3
Payments to Acquire Restricted Investments | 0 | (1)
Proceeds from (Repayments of) Related Party Debt | 0 | 0
Other, net | 0 | 0
Net cash used in investing activities exclusive of vehicle programs | (40) | (38)
Decrease (increase) in program cash | 87 | 198
Investment in vehicles | (3,944) | (4,140)
Proceeds received on disposition of vehicles | 2,958 | 2,776
Repayments of Related Party Debt | (33) | 0
Net cash used in investing activities of vehicle programs | (932) | (1,166)
Net cash used in investing activities | (972) | (1,204)
Proceeds from long-term borrowings | 590 | 350
Principal payments on borrowings | (143) | (5)
Net change in short-term borrowings | 0 | 1
Intercompany loan borrowings | 0 | 0
Repurchases of common stock | (61) | (95)
Debt financing fees | (7) | (5)
Other, net | 0 | 0
Net cash provided by financing activities exclusive of vehicle programs | 379 | 246
Proceeds from borrowings | 5,812 | 4,694
Principal payments on borrowings | (5,236) | (3,796)
Debt financing fees | (5) | (6)
Net cash provided by financing activities of vehicle programs | 571 | 892
Net cash provided by financing activities | 950 | 1,138
Effect of changes in exchange rates on cash and cash equivalents | 8 | 18
Net increase in cash and cash equivalents | 433 | 424
Cash and cash equivalents, beginning of period | 490 | 452
Cash and cash equivalents, end of period | 923 | 876
Parent [Member] |  |
Supplemental Guarantor Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 7 | 9
Property and equipment additions | 0 | 0
Proceeds received on asset sales | 0 | 0
Payments to Acquire Restricted Investments |  | 0
Proceeds from (Repayments of) Related Party Debt | 0 | 0
Other, net | 53 | 86
Net cash used in investing activities exclusive of vehicle programs | 53 | 86
Decrease (increase) in program cash | 0 | 0
Investment in vehicles | 0 | 0
Proceeds received on disposition of vehicles | 0 | 0
Repayments of Related Party Debt | 0 |
Net cash used in investing activities of vehicle programs | 0 | 0
Net cash used in investing activities | 53 | 86
Proceeds from long-term borrowings | 0 | 0
Principal payments on borrowings | 0 | 0
Net change in short-term borrowings |  | 0
Intercompany loan borrowings | 0 | 0
Repurchases of common stock | (61) | (95)
Debt financing fees | 0 | 0
Other, net | 0 | 0
Net cash provided by financing activities exclusive of vehicle programs | (61) | (95)
Proceeds from borrowings | 0 | 0
Principal payments on borrowings | 0 | 0
Debt financing fees | 0 | 0
Net cash provided by financing activities of vehicle programs | 0 | 0
Net cash provided by financing activities | (61) | (95)
Effect of changes in exchange rates on cash and cash equivalents | 0 | 0
Net increase in cash and cash equivalents | (1) | 0
Cash and cash equivalents, beginning of period | 3 | 4
Cash and cash equivalents, end of period | 2 | 4
Subsidiary Issuers [Member] |  |
Supplemental Guarantor Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (130) | 17
Property and equipment additions | (8) | (4)
Proceeds received on asset sales | 1 | 2
Payments to Acquire Restricted Investments |  | 0
Proceeds from (Repayments of) Related Party Debt | 0 | 0
Other, net | 0 | 0
Net cash used in investing activities exclusive of vehicle programs | (7) | (2)
Decrease (increase) in program cash | 0 | 0
Investment in vehicles | 0 | 0
Proceeds received on disposition of vehicles | 8 | 11
Repayments of Related Party Debt | 0 |
Net cash used in investing activities of vehicle programs | 8 | 11
Net cash used in investing activities | 1 | 9
Proceeds from long-term borrowings | 325 | 350
Principal payments on borrowings | (142) | (4)
Net change in short-term borrowings |  | 0
Intercompany loan borrowings | 270 | 0
Repurchases of common stock | 0 | 0
Debt financing fees | (3) | (5)
Other, net | (53) | (86)
Net cash provided by financing activities exclusive of vehicle programs | 397 | 255
Proceeds from borrowings | 0 | 0
Principal payments on borrowings | 0 | 0
Debt financing fees | 0 | 0
Net cash provided by financing activities of vehicle programs | 0 | 0
Net cash provided by financing activities | 397 | 255
Effect of changes in exchange rates on cash and cash equivalents | 0 | 0
Net increase in cash and cash equivalents | 268 | 281
Cash and cash equivalents, beginning of period | 12 | 70
Cash and cash equivalents, end of period | 280 | 351
Guarantor Subsidiaries [Member] |  |
Supplemental Guarantor Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 24 | (2)
Property and equipment additions | (19) | (21)
Proceeds received on asset sales | 0 | 0
Payments to Acquire Restricted Investments |  | 0
Proceeds from (Repayments of) Related Party Debt | 0 | 27
Other, net | 0 | 0
Net cash used in investing activities exclusive of vehicle programs | (19) | 6
Decrease (increase) in program cash | 0 | 0
Investment in vehicles | (1) | (1)
Proceeds received on disposition of vehicles | 0 | 0
Repayments of Related Party Debt | 0 |
Net cash used in investing activities of vehicle programs | (1) | (1)
Net cash used in investing activities | (20) | 5
Proceeds from long-term borrowings | 0 | 0
Principal payments on borrowings | (1) | (1)
Net change in short-term borrowings |  | 0
Intercompany loan borrowings | 0 | 0
Repurchases of common stock | 0 | 0
Debt financing fees | 0 | 0
Other, net | 0 | 0
Net cash provided by financing activities exclusive of vehicle programs | (1) | (1)
Proceeds from borrowings | 0 | 0
Principal payments on borrowings | (3) | (2)
Debt financing fees | 0 | 0
Net cash provided by financing activities of vehicle programs | (3) | (2)
Net cash provided by financing activities | (4) | (3)
Effect of changes in exchange rates on cash and cash equivalents | 0 | 0
Net increase in cash and cash equivalents | 0 | 0
Cash and cash equivalents, beginning of period | 0 | 0
Cash and cash equivalents, end of period | 0 | 0
Non-Guarantor Subsidiaries [Member] |  |
Supplemental Guarantor Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 546 | 448
Property and equipment additions | (15) | (15)
Proceeds received on asset sales | 1 | 1
Payments to Acquire Restricted Investments |  | (1)
Proceeds from (Repayments of) Related Party Debt | (270) | 0
Other, net | 0 | 0
Net cash used in investing activities exclusive of vehicle programs | (284) | (15)
Decrease (increase) in program cash | 87 | 198
Investment in vehicles | (3,943) | (4,139)
Proceeds received on disposition of vehicles | 2,950 | 2,765
Repayments of Related Party Debt | (33) |
Net cash used in investing activities of vehicle programs | (939) | (1,176)
Net cash used in investing activities | (1,223) | (1,191)
Proceeds from long-term borrowings | 265 | 0
Principal payments on borrowings | 0 | 0
Net change in short-term borrowings |  | 1
Intercompany loan borrowings | 0 | (27)
Repurchases of common stock | 0 | 0
Debt financing fees | (4) | 0
Other, net | 0 | 0
Net cash provided by financing activities exclusive of vehicle programs | 261 | (26)
Proceeds from borrowings | 5,812 | 4,694
Principal payments on borrowings | (5,233) | (3,794)
Debt financing fees | (5) | (6)
Net cash provided by financing activities of vehicle programs | 574 | 894
Net cash provided by financing activities | 835 | 868
Effect of changes in exchange rates on cash and cash equivalents | 8 | 18
Net increase in cash and cash equivalents | 166 | 143
Cash and cash equivalents, beginning of period | 475 | 378
Cash and cash equivalents, end of period | 641 | 521
Eliminations [Member] |  |
Supplemental Guarantor Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 0 | 0
Property and equipment additions | 0 | 0
Proceeds received on asset sales | 0 | 0
Payments to Acquire Restricted Investments |  | 0
Proceeds from (Repayments of) Related Party Debt | 270 | (27)
Other, net | (53) | (86)
Net cash used in investing activities exclusive of vehicle programs | 217 | (113)
Decrease (increase) in program cash | 0 | 0
Investment in vehicles | 0 | 0
Proceeds received on disposition of vehicles | 0 | 0
Repayments of Related Party Debt | 0 |
Net cash used in investing activities of vehicle programs | 0 | 0
Net cash used in investing activities | 217 | (113)
Proceeds from long-term borrowings | 0 | 0
Principal payments on borrowings | 0 | 0
Net change in short-term borrowings |  | 0
Intercompany loan borrowings | (270) | 27
Repurchases of common stock | 0 | 0
Debt financing fees | 0 | 0
Other, net | 53 | 86
Net cash provided by financing activities exclusive of vehicle programs | (217) | 113
Proceeds from borrowings | 0 | 0
Principal payments on borrowings | 0 | 0
Debt financing fees | 0 | 0
Net cash provided by financing activities of vehicle programs | 0 | 0
Net cash provided by financing activities | (217) | 113
Effect of changes in exchange rates on cash and cash equivalents | 0 | 0
Net increase in cash and cash equivalents | 0 | 0
Cash and cash equivalents, beginning of period | 0 | 0
Cash and cash equivalents, end of period | $ 0 | $ 0

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- Definition The net cash inflow (outflow) for borrowing related to vehicle programs, having initial term of repayment within one year or the normal operating cycle, if longer. + References No definition available. + Details
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- Definition The net cash outflow on repayment of principal on borrowings used for vehicle programs + References No definition available. + Details
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- Definition The cash outflow for a borrowing having initial term of repayment of more than one year or the normal operating cycle, if longer; and/or the cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References No definition available. + Details
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- Definition The net cash inflow (outflow) in aggregate debt due to repayments and proceeds from additional borrowings related to vehicle programs + References No definition available. + Details
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- Definition The cash inflow from a borrowing having initial term of repayment of more than one year or the normal operating cycle, if longer; and/or the cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References No definition available. + Details
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- Definition Current year acquisitions of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, and production equipment; or the cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References No definition available. + Details
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- Definition The cash outflow paid to third parties in connection with debt origination for vehicle programs, which will be amortized over the remaining maturity period of the associated long-term debt. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49171198&loc=d3e33268-110906 + Details
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- Definition Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49171198&loc=d3e33268-110906 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition Amount of cash (inflow) outflow from investing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3095-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow to acquire investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585 + Details
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- Definition Amount of cash inflow (outflow) from long-term debt by a related party. Related parties, include, but are not limited to, affiliates, owners or officers and their immediate families, and pension trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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