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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2010 | Jun. 30, 2013 M | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Effective tax rate | 30.00% |  |  | 25.00% | 79.00% |  |
State income tax benefit |  |  |  | $ 11 | $ 21 |  |
Income tax expense | 39 | 31 |  | 53 | 38 |  |
Pre-tax loss on continuing operations | (131) | 12 |  | (210) | (48) |  |
Reduction in the liability for unrecognized tax benefits | 3 |  |  | 3 |  |  |
Time limits for tax audit closings, settlements and expiration of applicable statutes of limitations in various jurisdictions |  |  |  | 12 |  |  |
Deferred tax assets expected to be realized |  |  |  | More than 50 percent |  |  |
Increase in tax expense from repatriation of foreign earnings |  |  | 372 |  |  |  |
Increase in tax expense from repatriation of foreign earnings |  |  |  |  |  | $ 65 | $ 89

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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