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Long-Term Debt - Additional Information (Detail) (USD $)
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3 Months Ended | ||
|---|---|---|---|
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Mar. 31, 2013
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Dec. 31, 2012
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Nov. 30, 2012
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| Debt Instrument [Line Items] | |||
| Carrying amount of other long term debt including current portion | $ 718,000,000 | $ 691,000,000 | |
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Senior Notes
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| Debt Instrument [Line Items] | |||
| Face amount | 3,000,000,000 | ||
| Number of tranches of debt issued | 3 | ||
| Unamortized discount | 26,000,000 | 27,000,000 | |
| Interest payment frequency | Semi-annually in arrears in May and November | ||
| Total estimated fair value of notes | $ 3,000,000,000 | $ 3,000,000,000 | |
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0.65% Notes due on November 27, 2015
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| Debt Instrument [Line Items] | |||
| Effective interest yields | 0.84% | ||
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1.20% Notes due on November 29, 2017
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| Debt Instrument [Line Items] | |||
| Effective interest yields | 1.38% | ||
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2.50% Notes due on November 29, 2022
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| Debt Instrument [Line Items] | |||
| Effective interest yields | 2.66% | ||
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Other Long Term Debt
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| Debt Instrument [Line Items] | |||
| Long-term debt, weighted average interest rate | 6.50% | 6.40% |