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Guarantor And Non-Guarantor Consolidating Condensed Financial Statements (Consolidating Condensed Statements Of Cash Flows) (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Supplemental Guarantor Financial Information [Line Items]        
Net cash provided by (used in) operating activities $ 2,095 $ 2,041    
Property and equipment additions (157) (138)    
Proceeds received on asset sales 9 6    
Payments to Acquire Restricted Investments (64) (17)    
Proceeds from (Repayments of) Related Party Debt   0    
Other, net (44) 6    
Net cash used in investing activities exclusive of vehicle programs (256) (143)    
Decrease (increase) in program cash   0    
Investment in vehicles (10,079) (9,672)    
Proceeds received on disposition of vehicles 6,752 6,872    
Repayments of Related Party Debt (116) (33)    
Proceeds from Related Party Debt 22 0    
Net cash used in investing activities of vehicle programs (3,421) (2,833)    
Net cash used in investing activities (3,677) (2,976)    
Proceeds from long-term borrowings 81 589    
Principal payments on borrowings (99) (596)    
Proceeds from (Repayments of) Short-term Debt (4) (3)    
Intercompany loan borrowings   0    
Repurchases of common stock (143) (144)    
Debt financing fees (9) (9)    
Other, net 3 0    
Net cash provided by financing activities exclusive of vehicle programs (171) (163)    
Proceeds from borrowings 13,371 14,276    
Principal payments on borrowings (11,727) (12,930)    
Debt financing fees (19) (8)    
Net cash provided by financing activities of vehicle programs 1,625 1,338    
Net cash provided by financing activities 1,454 1,175    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash (5) 41    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (133) 281    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 768 1,001 $ 901 $ 720
Eliminations [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Net cash provided by (used in) operating activities (119) (35)    
Property and equipment additions 0 0    
Proceeds received on asset sales 0 0    
Payments to Acquire Restricted Investments 0 0    
Proceeds from (Repayments of) Related Party Debt   264    
Other, net 0 (100)    
Net cash used in investing activities exclusive of vehicle programs 0 164    
Investment in vehicles 0 0    
Proceeds received on disposition of vehicles 0 0    
Repayments of Related Party Debt 0 0    
Proceeds from Related Party Debt 0      
Net cash used in investing activities of vehicle programs 0 0    
Net cash used in investing activities 0 164    
Proceeds from long-term borrowings 0 0    
Principal payments on borrowings 0 0    
Proceeds from (Repayments of) Short-term Debt 0 0    
Intercompany loan borrowings   (264)    
Repurchases of common stock 0 0    
Debt financing fees 0 0    
Other, net 119 135    
Net cash provided by financing activities exclusive of vehicle programs 119 (129)    
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 119 (129)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 0 0 0 0
Non-Guarantor Subsidiaries [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Other, net   6    
Decrease (increase) in program cash   0    
Net cash used in investing activities   (3,182)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash   41    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   276    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 692 981   705
Parent Company [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Net cash provided by (used in) operating activities 139 44    
Property and equipment additions 0 0    
Proceeds received on asset sales 0 0    
Payments to Acquire Restricted Investments 0 0    
Proceeds from (Repayments of) Related Party Debt   0    
Other, net 0 100    
Net cash used in investing activities exclusive of vehicle programs 0 100    
Investment in vehicles 0 0    
Proceeds received on disposition of vehicles 0 0    
Repayments of Related Party Debt 0 0    
Proceeds from Related Party Debt 0      
Net cash used in investing activities of vehicle programs 0 0    
Net cash used in investing activities 0 100    
Proceeds from long-term borrowings 0 0    
Principal payments on borrowings 0 0    
Proceeds from (Repayments of) Short-term Debt 0 0    
Intercompany loan borrowings   0    
Repurchases of common stock (143) (144)    
Debt financing fees 0 0    
Other, net 3 0    
Net cash provided by financing activities exclusive of vehicle programs (140) (144)    
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 (140) (144)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (1) 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 3 3 4 3
Subsidiaries [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Net cash provided by (used in) operating activities 202 (45)    
Property and equipment additions (45) (36)    
Proceeds received on asset sales 2 1    
Payments to Acquire Restricted Investments (3) (1)    
Proceeds from (Repayments of) Related Party Debt   0    
Other, net (8) 0    
Net cash used in investing activities exclusive of vehicle programs (54) (36)    
Investment in vehicles 0 0    
Proceeds received on disposition of vehicles 33 39    
Repayments of Related Party Debt 0 0    
Proceeds from Related Party Debt 0      
Net cash used in investing activities of vehicle programs 33 39    
Net cash used in investing activities (21) 3    
Proceeds from long-term borrowings 81 325    
Principal payments on borrowings (97) (401)    
Proceeds from (Repayments of) Short-term Debt 0 0    
Intercompany loan borrowings   264    
Repurchases of common stock 0 0    
Debt financing fees (9) (5)    
Other, net (95) (135)    
Net cash provided by financing activities exclusive of vehicle programs (120) 48    
Proceeds from borrowings 0 0    
Principal payments on borrowings (2) (1)    
Debt financing fees 0 0    
Net cash provided by financing activities of vehicle programs (2) (1)    
Net cash provided by financing activities (122) 47    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 59 5    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 73 17 14 12
Guarantor Subsidiaries [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Net cash provided by (used in) operating activities 88 70    
Property and equipment additions (60) (56)    
Proceeds received on asset sales 2 0    
Payments to Acquire Restricted Investments (5) (5)    
Proceeds from (Repayments of) Related Party Debt   0    
Other, net 0 0    
Net cash used in investing activities exclusive of vehicle programs (63) (61)    
Investment in vehicles (4) 0    
Proceeds received on disposition of vehicles 0 0    
Repayments of Related Party Debt 0 0    
Proceeds from Related Party Debt 0      
Net cash used in investing activities of vehicle programs (4) 0    
Net cash used in investing activities (67) (61)    
Proceeds from long-term borrowings 0 0    
Principal payments on borrowings (2) (2)    
Proceeds from (Repayments of) Short-term Debt 0 0    
Intercompany loan borrowings   0    
Repurchases of common stock 0 0    
Debt financing fees 0 0    
Other, net (12) 0    
Net cash provided by financing activities exclusive of vehicle programs (14) (2)    
Proceeds from borrowings 0 0    
Principal payments on borrowings (7) (7)    
Debt financing fees 0 0    
Net cash provided by financing activities of vehicle programs (7) (7)    
Net cash provided by financing activities (21) (9)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 0 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 0 0 0 0
Subsidiaries Non Guarantor [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Net cash provided by (used in) operating activities 1,785 2,007    
Property and equipment additions (52) (46)    
Proceeds received on asset sales 5 5    
Payments to Acquire Restricted Investments (56) (11)    
Proceeds from (Repayments of) Related Party Debt   (264)    
Other, net (36) 6    
Net cash used in investing activities exclusive of vehicle programs (139) (310)    
Investment in vehicles (10,075) (9,672)    
Proceeds received on disposition of vehicles 6,719 6,833    
Repayments of Related Party Debt (116) (33)    
Proceeds from Related Party Debt 22      
Net cash used in investing activities of vehicle programs (3,450) (2,872)    
Net cash used in investing activities (3,589) (3,182)    
Proceeds from long-term borrowings 0 264    
Principal payments on borrowings 0 (193)    
Proceeds from (Repayments of) Short-term Debt (4) (3)    
Intercompany loan borrowings   0    
Repurchases of common stock 0 0    
Debt financing fees 0 (4)    
Other, net (12) 0    
Net cash provided by financing activities exclusive of vehicle programs (16) 64    
Proceeds from borrowings 13,371 14,276    
Principal payments on borrowings (11,718) (12,922)    
Debt financing fees (19) (8)    
Net cash provided by financing activities of vehicle programs 1,634 1,346    
Net cash provided by financing activities 1,618 1,410    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash (5) 41    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (191) 276    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 692 981 $ 883 705
Scenario, Previously Reported [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Other, net   (5)    
Decrease (increase) in program cash   (53)    
Net cash used in investing activities   (2,924)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash   32    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   324    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   814   490
Scenario, Previously Reported [Member] | Non-Guarantor Subsidiaries [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Other, net   5    
Decrease (increase) in program cash   (53)    
Net cash used in investing activities   (3,130)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash   32    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   319    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   794   475
Restatement Adjustment [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Other, net   (1)    
Decrease (increase) in program cash   53    
Net cash used in investing activities   (52)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash   9    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   (43)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   187   230
Restatement Adjustment [Member] | Non-Guarantor Subsidiaries [Member]        
Supplemental Guarantor Financial Information [Line Items]        
Other, net   1    
Decrease (increase) in program cash   53    
Net cash used in investing activities   (52)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash   9    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   (43)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   $ 187   $ 230