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Fair Value Measurements - Unobservable Data Used in Recurring Valuations of Level 3 (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Level 3 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative financial instruments, Fair Value | $ (845) |
Interest Rate Swaps [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative financial instruments, Fair Value | 753 | $ 566
Cross-Currency Interest Rate Swaps [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative financial instruments, Fair Value | (842) | (986)
Cross-Currency Interest Rate Swaps [Member] | Level 3 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative financial instruments, Fair Value | $ (801) |
Discounted cash flow | Discounted cash flow |
Cross-Currency Interest Rate Swaps [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value, Net Derivative Asset (Liability) 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, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 2.80% |
Other [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative financial instruments, Fair Value | $ (7) | $ (2)
Other [Member] | Level 3 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative financial instruments, Fair Value | (7) |
Consumer Price Index/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Level 3 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative financial instruments, Fair Value | $ 10 |
Discounted cash flow | Discounted cash flow |
Consumer Price Index/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value, Net Derivative Asset (Liability) 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] | Minimum [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 0.02% |
Consumer Price Index/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Bid/Ask Adjustment to Discount Rate [Member] | Maximum [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 0.05% |
Consumer Price Index/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Bid/Ask Adjustment to Discount Rate [Member] | Weighted Average [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 0.05% |
Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Level 3 [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative financial instruments, Fair Value | $ (47) |
Discounted cash flow | Discounted cash flow |
Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Fair Value Measurements Recurring [Member] |  |
Fair Value, Net Derivative Asset (Liability) 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] | Minimum [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 0.03% |
Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Bid/Ask Adjustment to Discount Rate [Member] | Maximum [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 0.05% |
Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Bid/Ask Adjustment to Discount Rate [Member] | Weighted Average [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 0.05% |
Prime/LIBOR Basis Swaps [Member] | Interest Rate Swaps [Member] | Constant Prepayment Rate [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Derivative, Basis Spread on Variable Rate | 4.90% |

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