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Pension and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended | 5 Months Ended | 12 Months Ended |  |
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Jan. 31, 2011 | Dec. 31, 2012 Y | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Dec. 31, 2012 Subsequent Event [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2008 Maximum [Member] | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Pension Benefits [Member] Y | Dec. 31, 2012 Foreign Pension Plans, Defined Benefit [Member] Y | Dec. 31, 2012 10-Year Moving Average [Member] Y | Dec. 31, 2012 20-Year Moving Average [Member] Y | Dec. 31, 2008 20-Year Moving Average [Member] Minimum [Member] | May 31, 2010 United Steelworkers Labor Agreement [Member] | Dec. 31, 2010 United Steelworkers Labor Agreement [Member] | Jun. 24, 2010 United Steelworkers Labor Agreement [Member] Employees Location Y | Dec. 31, 2009 United Steelworkers Labor Agreement [Member]
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of labor agreement, in years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |
Number of employees covered by labor agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,400 |
Number of locations affected by labor agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |
Pretax costs related to preparation for and ratification of new agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20 |  |
After-tax costs related to preparation for and ratification of new agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 |  |
Weighted average discount rate used to determine pension benefit obligation |  | 4.15% | 4.90% |  |  |  |  |  |  |  |  |  |  |  |  | 5.95% |  |  | 6.15%
Increase in pension liability, plan amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 166 |  |  |
Increase in net actuarial loss after-tax, plan amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 108 |  |  |
Increase in net periodic benefit cost, plan amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |
Average duration refined yield curve model parallels the plans, years |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage increase in rate of compensation |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |
Average period over which rate of compensation increases, years |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |  |  |
Average period of historical returns used to calculate expected future returns, in years |  | 5 |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Period of moving averages used for historical data points used to determine the expected long-term rate of return on plan assets, in years |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 20 |  |  |  |  |
Expected long term rate of return on plan assets |  | 8.50% | 8.50% | 8.75% | 8.75% | 9.00% | 8.50% |  |  |  |  |  |  |  |  |  |  |  |
10-year moving average of actual performance |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |
20-year moving average of actual performance |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |
Health care cost trend rate assumed for next year |  | 6.00% | 6.50% | 6.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Health care cost trend rate |  | 4.50% | 5.00% | 5.00% |  |  |  | 3.80% |  | (6.20%) |  |  |  |  |  |  |  |  |
Number of years over actual annual health care cost trend experience |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collateral, which exceeds the value of the securities loaned |  |  |  |  |  |  |  | 105.00% |  | 102.00% |  |  |  |  |  |  |  |  |
Cash contribution to pension plans |  | 561 | 336 | 113 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock shares newly issued |  |  | 600 | 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of funded status of pension plans | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum required cash contribution to pension plan in 2012 |  | 460 |  |  |  |  |  |  |  |  |  | 140 |  |  |  |  |  |  |
Expenses related to saving and investment plans |  | $ 146 | $ 139 | $ 119 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The after-tax amount of costs an entity incurs due to the preparation for and ratification of a new union labor agreement. This may include costs for the preparation of a potential strike, upfront, one-time signing bonuses or other similar benefits upon ratification of new agreement, charges related to actuarial changes in pension and other postretirement benefit plans due to the provisions of the new agreement, etc. + References No definition available. + Details
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- Definition The amount of costs an entity incurs due to the preparation for and ratification of a new union labor agreement. This may include costs for the preparation of a potential strike, upfront, one-time signing bonuses or other similar benefits upon ratification of new agreement, charges related to actuarial changes in pension and other postretirement benefit plans due to the provisions of the new agreement, etc. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -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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- Definition The amount of increase or decrease in net periodic benefit cost related to the effects of a change in the substantive terms of an existing defined benefit plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520743 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph r -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520782 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l -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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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -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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- Definition The increase (decrease) during the reporting period in the amount due to fund retirement benefits to employees, retired and disabled former employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition Net of tax amount of the (increase) decrease in the value of the projected benefit obligation and the increase (decrease) in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 + Details
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- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 + Details
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