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Accumulated Other Comprehensive Income (loss) - Reclassifications from Accumulated Other Comprehensive Income (Loss) to Income Statement (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Amortization of defined benefit pension: |  |  |  |
Accumulated other comprehensive income, defined benefit pension, Tax Expense | $ (39) | $ (31) | $ (53) | $ (38)
Accumulated other comprehensive income, defined benefit pension net of tax | 75 | (76) | 121 | (43)
Amount Reclassified [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Amortization of defined benefit pension: |  |  |  |
Accumulated other comprehensive income, defined benefit pension net of tax | 4 | 4 | 9 | 8
Selling, General & Administrative Expense [Member] | Amount Reclassified [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Amortization of defined benefit pension: |  |  |  |
Accumulated other comprehensive income, defined benefit pension, Selling, General and Administrative Expense | 4 | 4 | 9 | 8
Tax expense [Member] | Amount Reclassified [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Amortization of defined benefit pension: |  |  |  |
Accumulated other comprehensive income, defined benefit pension, Tax Expense |  |  |  |
Interest expense [Member] | Amount Reclassified [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Amortization of defined benefit pension: |  |  |  |
Interest rate swaps | $ 1 |  | $ 1 |

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- Definition Amount 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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The net amount of operating interest income (expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 10 -Article 9 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans. + 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=28358780&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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=28361610&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 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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