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Financial Instruments - Fair Value of Derivatives Segregated Between Those Derivatives That are Designated as Hedging Instruments and Those That are Not Designated as Hedging Instruments (Detail) (USD $)
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Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Asset | $ 1,090,000,000 | $ 731,000,000 |
| Fair value of derivative, Liability | 184,000,000 | 229,000,000 |
| U.S. Dollar Notional | 29,909,000,000 | 26,556,000,000 |
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Derivatives Designated as Hedging Instruments [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Asset | 1,021,000,000 | 668,000,000 |
| Fair value of derivative, Liability | 44,000,000 | 13,000,000 |
| U.S. Dollar Notional | 16,312,000,000 | 13,573,000,000 |
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Derivatives Not Designated as Hedging Instruments [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Asset | 69,000,000 | 63,000,000 |
| Fair value of derivative, Liability | 140,000,000 | 216,000,000 |
| U.S. Dollar Notional | 13,597,000,000 | 12,983,000,000 |
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Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Other assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Asset | 13,000,000 | 0 |
| U.S. Dollar Notional | 1,550,000,000 | 0 |
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Interest Rate Swap [Member] | Derivatives Designated as Hedging Instruments [Member] | Deferred income taxes and noncurrent liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Liability | 25,000,000 | 0 |
| U.S. Dollar Notional | 2,000,000,000 | 0 |
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Foreign exchange contract [Member] | Derivatives Designated as Hedging Instruments [Member] | Deferred income taxes and other current assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Asset | 493,000,000 | 281,000,000 |
| U.S. Dollar Notional | 4,427,000,000 | 6,646,000,000 |
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Foreign exchange contract [Member] | Derivatives Designated as Hedging Instruments [Member] | Other assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Asset | 515,000,000 | 387,000,000 |
| U.S. Dollar Notional | 6,676,000,000 | 5,989,000,000 |
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Foreign exchange contract [Member] | Derivatives Designated as Hedging Instruments [Member] | Accrued and other current liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Liability | 19,000,000 | 13,000,000 |
| U.S. Dollar Notional | 1,659,000,000 | 938,000,000 |
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Foreign exchange contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Deferred income taxes and other current assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Asset | 69,000,000 | 55,000,000 |
| Fair value of derivative, Liability | ||
| U.S. Dollar Notional | 5,705,000,000 | 4,548,000,000 |
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Foreign exchange contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Other assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Asset | 0 | 8,000,000 |
| U.S. Dollar Notional | 0 | 232,000,000 |
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Foreign exchange contract [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Accrued and other current liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative, Liability | 140,000,000 | 216,000,000 |
| U.S. Dollar Notional | $ 7,892,000,000 | $ 8,203,000,000 |