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Commitments and Contingencies - Additional Information (Detail) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 25, 2010 EUR (€) | Mar. 31, 2007 USD ($) | Feb. 28, 2002 USD ($) | Jun. 30, 2013 USD ($) | Jun. 30, 2013 EUR (€) | Dec. 31, 2002 USD ($) | Dec. 31, 2012 USD ($) | Sep. 19, 2008 Trust | Dec. 05, 2002 USD ($)
Commitments And Contingencies Disclosure [Abstract] |  |  |  |  |  |  |  |  |
Settlement agreement pre-tax charge |  |  |  |  |  | $ 850 |  |  |
Charge covering a cash payment that will be required to make under Settlement agreement upon the effectiveness of an appropriate plan of reorganization |  |  |  |  |  | 513 |  |  |
Percentage of annual interest that accrues on Settlement agreement charges from December 21, 2002 to the date of payment |  |  |  |  |  | 5.50% |  |  |
Accrued interest compounded annually included in Settlement agreement and related accrued interest |  |  |  | 388 |  |  | 364 |  |
Non - cash charges at fair value market |  |  |  |  |  | 322 |  |  |
Original number of shares expect to be issued under Settlement agreement |  | 9,000,000 |  |  |  |  |  |  |
Adjustment of company's common stock that is charged and expected to be issued under settlement agreement |  | To eighteen million shares due to our two-for-one stock split in March 2007 |  |  |  |  |  |  |
Original number of shares expected to be issued under Settlement agreement, adjusted |  | 18,000,000 |  |  |  |  |  |  |
Amount per common share pre-split |  |  |  |  |  |  |  |  | $ 35.72
Amount per common share post-split |  |  |  |  |  |  |  |  | $ 17.86
Par value of common stock reserved for issuance related to the Settlement agreement |  | 0.9 |  |  |  | 0.9 |  |  |
Excess of the aggregate fair value market over aggregated par value of common shares |  |  |  |  |  | 321 |  |  |
Legal and related fees related to Settlement agreement |  |  |  |  |  | 16 |  |  |
Establishment of asbestos trust under Section 524(g) |  |  |  |  |  |  |  | 2 |
Voting Declaration with respect to the PI Settlement Plan |  |  |  | According to the Voting Declaration, with respect to each class of claims designated as impaired by Grace, the PI Settlement Plan was approved by holders of at least two-thirds in amount and more than one-half in number (or for classes voting for purposes of Section 524(g) of the Bankruptcy Code, at least 75% in number) of voted claims | According to the Voting Declaration, with respect to each class of claims designated as impaired by Grace, the PI Settlement Plan was approved by holders of at least two-thirds in amount and more than one-half in number (or for classes voting for purposes of Section 524(g) of the Bankruptcy Code, at least 75% in number) of voted claims |  |  |  |
Minimum percentage of holders required to approve PI settlement under bankruptcy code |  |  |  | 75.00% | 75.00% |  |  |  |
Charges accrued for potential liabilities |  |  | 172 |  |  |  |  |  |
Repayment of grant monies paid | € 5.1 |  |  | $ 13.0 | € 10.1 |  |  |  |

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