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Debt - Schedule of Long-term Debt (Parenthetical) (Detail) | 12 Months Ended |
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Dec. 31, 2012 | Mar. 15, 2012
Debt Instrument [Line Items] |  |
Long-term debt maturity date | Mar. 15, 2022 |
5.875% Notes and debentures due 15 July 2012 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 5.875% |
Long-term debt maturity date | Jul. 15, 2012 |
7.125% Notes and debentures due 15 August 2013 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 7.125% |
Long-term debt maturity date | Aug. 15, 2013 |
4.8% Notes and debentures due 15 June 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 4.80% |
Long-term debt maturity date | Jun. 15, 2015 |
6.125% Notes and debentures due 3 October 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 6.125% |
Long-term debt maturity date | Oct. 03, 2016 |
5.85% Notes and debentures due 15 March 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 5.85% |
Long-term debt maturity date | Mar. 15, 2017 |
6.625% Notes and debentures due 15 April 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 6.625% |
Long-term debt maturity date | Apr. 15, 2018 |
7.125% Notes and debentures due 15 March 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 7.125% |
Long-term debt maturity date | Mar. 15, 2020 |
5.95% Notes and debentures due 15 March 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 5.95% | 5.95%
Long-term debt maturity date | Mar. 15, 2022 |
7.75% Notes and debentures due 1 August 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 7.75% |
Long-term debt maturity date | Aug. 01, 2029 |
6.5% Notes and debentures due 15 August 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Interest on notes | 6.50% |
Long-term debt maturity date | Aug. 15, 2032 |

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- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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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Period Type: | duration

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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