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Basis Of Presentation And Recently Issued Accounting Pronouncements (Narrative) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Impact of ASU 2018-02 [Line Items]            
Cash and Cash Equivalents, at Carrying Value $ 489 $ 776 $ 489 $ 776 $ 611  
Document Period End Date     Jun. 30, 2018      
Revenues 2,328 2,238 $ 4,296 4,077    
Operating Costs and Expenses (1,175) (1,108) (2,267) (2,157)    
Costs and Expenses (2,290) (2,227) (4,387) (4,231)    
Income (loss) before income taxes 38 11 (91) (154)    
Provision for (benefit from) income taxes 12 8 (30) (50)    
Net Income (Loss) Attributable to Parent 26 3 (61) (104)    
Comprehensive Income (Loss), Net of Tax, Attributable to Parent (24) 51 (103) (28)    
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 1,120   1,120   931  
Total assets exclusive of assets under vehicle programs 6,193   6,193   5,820  
Assets 20,919   20,919   17,699  
Accounts payable and other current liabilities 1,832   1,832   1,619  
Total current liabilities 1,856   1,856   1,645  
Other non-current liabilities 745   745   717  
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs 6,145   6,145   5,935  
Retained Earnings (Accumulated Deficit) (1,316)   (1,316)   (1,222)  
Total stockholders’ equity 372   372   573  
Program cash 161 65 161 65 283  
Restricted Cash and Cash Equivalents 11 7 11 7    
Decrease Increase In Program Cash       0    
Payments for (Proceeds from) Other Investing Activities     37 0    
Net Cash Provided by (Used in) Investing Activities     (3,748) (3,186)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash     (2) 36    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect     (240) 128    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 661 848 661 848 901 $ 720
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         6  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Impact of ASU 2018-02 [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         12  
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]            
Impact of ASU 2018-02 [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         2  
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]            
Impact of ASU 2018-02 [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         (1)  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Impact of ASU 2018-02 [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         (7)  
Accounting Standards Update 2018-02 [Member]            
Impact of ASU 2018-02 [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         4  
Accounting Standards Update 2018-02 [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Impact of ASU 2018-02 [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         (12)  
Accounting Standards Update 2018-02 [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]            
Impact of ASU 2018-02 [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         0  
Accounting Standards Update 2018-02 [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]            
Impact of ASU 2018-02 [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         1  
Accounting Standards Update 2018-02 [Member] | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Impact of ASU 2018-02 [Line Items]            
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         $ 7  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Impact of ASU 2018-02 [Line Items]            
Revenues     4,303      
Operating Costs and Expenses     (2,268)      
Costs and Expenses     (4,388)      
Income (loss) before income taxes     (85)      
Provision for (benefit from) income taxes     (28)      
Net Income (Loss) Attributable to Parent     (57)      
Comprehensive Income (Loss), Net of Tax, Attributable to Parent     (99)      
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 1,108   1,108      
Total assets exclusive of assets under vehicle programs 6,181   6,181      
Assets 20,907   20,907      
Accounts payable and other current liabilities 1,826   1,826      
Total current liabilities 1,850   1,850      
Other non-current liabilities 695   695      
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs 6,095   6,095      
Retained Earnings (Accumulated Deficit) (1,272)   (1,272)      
Total stockholders’ equity 416   416      
Restatement Adjustment [Member]            
Impact of ASU 2018-02 [Line Items]            
Revenues     (7)      
Operating Costs and Expenses     (1)      
Costs and Expenses     (1)      
Income (loss) before income taxes     (6)      
Provision for (benefit from) income taxes     (2)      
Net Income (Loss) Attributable to Parent     (4)      
Comprehensive Income (Loss), Net of Tax, Attributable to Parent     (4)      
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 12   12      
Total assets exclusive of assets under vehicle programs 12   12      
Assets 12   12      
Accounts payable and other current liabilities 6   6      
Total current liabilities 6   6      
Other non-current liabilities 50   50      
Total Liabilities Exclusive Of Liabilities Under Vehicle Programs 50   50      
Retained Earnings (Accumulated Deficit) (44)   (44)      
Total stockholders’ equity $ (44)   $ (44)      
Scenario, Previously Reported [Member]            
Impact of ASU 2018-02 [Line Items]            
Decrease Increase In Program Cash       168    
Payments for (Proceeds from) Other Investing Activities       (1)    
Net Cash Provided by (Used in) Investing Activities       (3,019)    
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash       27    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect       286    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   776   776   490
Restatement Adjustment [Member]            
Impact of ASU 2018-02 [Line Items]            
Decrease Increase In Program Cash       (168)    
Payments for (Proceeds from) Other Investing Activities       1    
Net Cash Provided by (Used in) Investing Activities       (167)    
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       (158)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   $ 72   $ 72   $ 230