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Debt - Schedule of Long-term Debt (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Mar. 05, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | $ 3,628 | $ 400 | $ 4,025
Less: Current portion | 206 |  | 803
Total Long-term debt | 3,422 |  | 3,222
5.875% Notes and debentures due 15 July 2012 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures |  |  | 791
7.125% Notes and debentures due 15 August 2013 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | 200 |  | 200
4.8% Notes and debentures due 15 June 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | 500 |  | 500
6.125% Notes and debentures due 3 October 2016 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | 1,000 |  | 1,000
5.85% Notes and debentures due 15 March 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | 300 |  | 300
6.625% Notes and debentures due 15 April 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | 114 |  | 114
7.125% Notes and debentures due 15 March 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | 500 |  | 500
5.95% Notes and debentures due 15 March 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | 400 |  |
7.75% Notes and debentures due 1 August 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | 296 |  | 296
6.5% Notes and debentures due 15 August 2032 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | 300 |  | 300
Other Notes and debentures [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt includes notes and debentures | $ 18 |  | $ 24

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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 Carrying amount of long-term debt, net of unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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