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Fair Value Measurements - Unobservable Data Used in Recurring Valuations of Level 3 (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Derivative financial instruments $ 899
Cross-Currency Interest Rate Swaps [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Derivative financial instruments 1,007
Discounted cash flow Discounted cash flow
Cross-Currency Interest Rate Swaps [Member] | Fair Value Measurements Recurring [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Constant prepayment rate Constant Prepayment Rate
Cross-Currency Interest Rate Swaps [Member] | Constant Prepayment Rate [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Derivative, Basis Spread on Variable Rate 2.60%
Other [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Derivative financial instruments (21)
Consumer Price Index/LIBOR Basis Swaps [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Derivative financial instruments 33
Discounted cash flow Discounted cash flow
Consumer Price Index/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Fair Value Measurements Recurring [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Bid/ask adjustment to discount rate Bid/ask adjustment to discount rate
Consumer Price Index/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Bid/Ask Adjustment to Discount Rate [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Derivative, Lower Range of Basis Spread on Variable Rate 0.05%
Derivative, Higher Range of Basis Spread on Variable Rate 0.05%
Derivative, Basis Spread on Variable Rate 0.05%
Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Derivative financial instruments $ (120)
Discounted cash flow Discounted cash flow
Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Fair Value Measurements Recurring [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Constant prepayment rate Constant Prepayment Rate
Bid/ask adjustment to discount rate Bid/ask adjustment to discount rate
Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Bid/Ask Adjustment to Discount Rate [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Derivative, Lower Range of Basis Spread on Variable Rate 0.08%
Derivative, Higher Range of Basis Spread on Variable Rate 0.08%
Derivative, Basis Spread on Variable Rate 0.08%
Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Constant Prepayment Rate [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]  
Derivative, Basis Spread on Variable Rate 4.20%