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Debt - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  |
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Jan. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 15, 2012 | Mar. 05, 2012 | Jun. 21, 2010 | Dec. 31, 2012 Euros Denominated Revolver [Member] | Dec. 31, 2012 Swingline Loans [Member] | Dec. 31, 2012 Letters of Credit [Member] | Dec. 31, 2012 6.625% Notes and Debentures Due 15 April 2018 [Member] | Dec. 31, 2011 6.625% Notes and Debentures Due 15 April 2018 [Member] | Dec. 31, 2012 7.75% Notes and Debentures Due 1 August 2029 [Member] | Dec. 31, 2011 7.75% Notes and Debentures Due 1 August 2029 [Member] | Dec. 31, 2012 5.95% Notes and Debentures Due 15 March 2022 [Member] | Mar. 15, 2012 5.95% Notes and Debentures Due 15 March 2022 [Member] | Jan. 31, 2012 5.875% Notes and Debentures Due 15 July 2012 [Member] | Dec. 31, 2012 5.875% Notes and Debentures Due 15 July 2012 [Member] | Jul. 31, 2012 5.875% Notes and Debentures Due 15 July 2012 [Member] | Dec. 31, 2011 5.875% Notes and Debentures Due 15 July 2012 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest on notes |  |  |  |  |  |  |  |  |  |  | 6.625% |  | 7.75% |  | 5.95% | 5.95% |  | 5.875% |  |
Long term debt maturity date |  | Mar. 15, 2022 |  |  |  |  |  |  |  |  | Apr. 15, 2018 |  | Aug. 01, 2029 |  | Mar. 15, 2022 |  |  | Jul. 15, 2012 |  |
Long term debt notes |  | $ 3,628,000,000 | $ 4,025,000,000 |  |  | $ 400,000,000 |  |  |  |  | $ 114,000,000 | $ 114,000,000 | $ 296,000,000 | $ 296,000,000 | $ 400,000,000 |  |  |  |  | $ 791,000,000
Effective interest rate |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company repurchased Notes in open-market transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46,000,000 |  |  |
Premium paid on repurchase of notes | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued notes |  | 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 745,000,000 |
Aggregate amount add back to future non-cash charges |  | 250,000,000 |  |  |  |  | 1,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Interest Coverage Ratio |  | 2.25 to 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum Interest Coverage Ratio after Period |  | 2.50 to 1.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to total adjusted capitalization ratio |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity, maximum |  |  |  |  |  |  |  | 500,000,000 | 150,000,000 | 250,000,000 |  |  |  |  |  |  |  |  |  |
Outstanding and unused Letters of Credit |  |  |  |  |  |  |  |  |  | 78,000,000 |  |  |  |  |  |  |  |  |  |
Either rate per annum equal to lower of prime rate federal funds effective rate plus half percent plus applicable margin |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Either rate per annum equal to lower of prime rate federal funds effective LIBOR plus one percent plus applicable margin |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing capacity |  | 873,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Absorption of reduction to shareholders' equity to remain in compliance with covenant |  | 470,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under Credit Agreement |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term Debt in year 2013 |  | 206,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term Debt in year 2014 |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term Debt in year 2015 |  | 501,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term Debt in year 2016 |  | 1,001,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturities of long term Debt in year 2017 |  | 301,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Paid |  | $ 269,000,000 | $ 254,000,000 | $ 241,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: 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. 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 5: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 47 -Paragraph 10 -Subparagraph b -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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