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Debt - Additional Information (Detail) (USD $) | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2012 | Sep. 30, 2012 FinancialCovenants | Sep. 30, 2012 5.95% Notes and Debentures due March 15, 2022 [Member] | Mar. 05, 2012 5.95% Notes and Debentures due March 15, 2022 [Member] | Sep. 30, 2012 5.875% Notes and Debentures due July 16, 2012 [Member] | Jul. 16, 2012 5.875% Notes and Debentures due July 16, 2012 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |
Interest on notes |  |  | 5.95% |  | 5.875% |
Issued notes |  | $ 400,000,000 |  | $ 400,000,000 |  | $ 745,000,000
Effective interest rate for notes |  | 6.50% |  |  |  |
Company repurchased Notes in open-market transactions | 46,000,000 |  |  |  |  |
Premium paid on repurchase of notes | 1,000,000 |  |  |  |  |
Additional borrowing capacity |  | 1,000,000,000 |  |  |  |
Absorption of reduction to shareholders' equity to remain in compliance with covenant |  | 547,000,000 |  |  |  |
Financial covenants |  | 2 |  |  |  |
Borrowings under Five Year Revolving Credit Agreement |  | $ 0 |  |  |  |

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- Definition Absorption of reduction to shareholders' equity to remain in compliance with covenant. + References No definition available. + Details
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- Definition Financial covenants. + References No definition available. + Details
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- Definition Issued notes. + References No definition available. + Details
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- Definition Line of credit facility increase additional borrowing. + References No definition available. + Details
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- Definition Premium paid on repurchase of notes. + References No definition available. + Details
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- Definition Decrease for amounts repaid on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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