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Financial Instruments (Narrative) (Detail)
gal in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
gal
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
gal
Jun. 30, 2015
USD ($)
Schedule of Cost-method Investments [Line Items]        
Document Period End Date     Jun. 30, 2016  
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net $ 7   $ 7  
Derivative Instruments, Gain (Loss) Recognized in Income, Net 25 $ (26) (4) $ 43
Interest Rate Caps [Member]        
Schedule of Cost-method Investments [Line Items]        
Absolute notional values of derivative instruments 9,608   9,608  
Interest Rate Caps [Member] | Interest Rate Caps Purchased [Member]        
Schedule of Cost-method Investments [Line Items]        
Absolute notional values of derivative instruments 2,300   2,300  
Interest Rate Caps [Member] | Interest Rate Caps Purchased [Member] | Subsidiary Issuers [Member]        
Schedule of Cost-method Investments [Line Items]        
Absolute notional values of derivative instruments 5,000   5,000  
Interest Rate Caps [Member] | Interest Rate Caps Sold [Member]        
Schedule of Cost-method Investments [Line Items]        
Absolute notional values of derivative instruments 7,300   7,300  
Interest Rate Swaps [Member]        
Schedule of Cost-method Investments [Line Items]        
Absolute notional values of derivative instruments $ 2,400   $ 2,400  
Commodity Contracts [Member]        
Schedule of Cost-method Investments [Line Items]        
Units Of Gasoline | gal 10   10  
Currency Swap [Member]        
Schedule of Cost-method Investments [Line Items]        
Absolute notional values of derivative instruments $ 993   $ 993  
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]        
Schedule of Cost-method Investments [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 2 4 0 4
Interest Expense [Member]        
Schedule of Cost-method Investments [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net 26 $ 19 35 2
Operating Expense [Member]        
Schedule of Cost-method Investments [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net $ 4   $ 23 $ 14