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Derivative Instruments and Hedging Activities - Additional Information (Detail)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
CAD
Foreign Currency Derivatives [Member] | Principal [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional amount of derivatives for intercompany debt | CAD       CAD 370,000,000
Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Cash received in termination of foreign exchange cross currency swaps $ 67      
Expense associated with termination of foreign exchange cross currency swaps 8      
Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member] | Long-term other assets [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Foreign currency derivatives, Assets     $ 63  
Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member] | Current Other Assets [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Foreign currency derivatives, Assets     15  
Forward Starting Interest Rate Swap [Member] | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Deferred losses, net of taxes, related to cash flow hedges included in accumulated other comprehensive income (loss) $ 41   43  
Term of senior notes to amortize deferred losses 10 years      
Treasury rate locks [Member] | Cash Flow Hedging [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Deferred losses scheduled to be reclassified out of accumulated other comprehensive into interest expense over next 12 months, pre-tax $ 11      
Interest Rate Swaps [Member] | Fair Value Hedge [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Increase in carrying value of debt instruments from fair value hedge accounting for interest rate swaps 21   $ 23  
Benefits (losses) to interest expense associated with the amortization of our terminated interest rate swaps $ 2 $ 2