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Employee Retirement Plans - Qualified Defined-Benefit Pension Plan Assets at Fair Value (Detail) (Qualified Plans [Member], USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | $ 594 | $ 504 | $ 509
United States [Member] | Common and Preferred Stocks [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 188 | 157 |
United States [Member] | Corporate Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 25 | 15 |
United States [Member] | Government and Other Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 93 | 77 |
United States [Member] | Common Collective Trust Fund [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 12 | 8 |
United States [Member] | Short-Term and Other Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 1 | 2 |
United States [Member] | Private Equity and Hedge Funds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 52 | 52 |
International [Member] | Common and Preferred Stocks [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 71 | 65 |
International [Member] | Corporate Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 73 | 55 |
International [Member] | Government and Other Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 53 | 53 |
International [Member] | Short-Term and Other Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 15 | 13 |
International [Member] | Private Equity and Hedge Funds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 11 | 7 |
Assets at Fair Value (Level 1) [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 264 | 247 |
Assets at Fair Value (Level 1) [Member] | United States [Member] | Common and Preferred Stocks [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 127 | 119 |
Assets at Fair Value (Level 1) [Member] | United States [Member] | Government and Other Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 51 | 46 |
Assets at Fair Value (Level 1) [Member] | United States [Member] | Short-Term and Other Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 1 | 2 |
Assets at Fair Value (Level 1) [Member] | International [Member] | Common and Preferred Stocks [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 61 | 56 |
Assets at Fair Value (Level 1) [Member] | International [Member] | Government and Other Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 24 | 24 |
Assets at Fair Value (Level 2) [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 252 | 185 |
Assets at Fair Value (Level 2) [Member] | United States [Member] | Common and Preferred Stocks [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 61 | 38 |
Assets at Fair Value (Level 2) [Member] | United States [Member] | Corporate Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 25 | 15 |
Assets at Fair Value (Level 2) [Member] | United States [Member] | Government and Other Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 42 | 31 |
Assets at Fair Value (Level 2) [Member] | United States [Member] | Common Collective Trust Fund [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 12 | 8 |
Assets at Fair Value (Level 2) [Member] | International [Member] | Common and Preferred Stocks [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 10 | 9 |
Assets at Fair Value (Level 2) [Member] | International [Member] | Corporate Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 73 | 55 |
Assets at Fair Value (Level 2) [Member] | International [Member] | Government and Other Debt Securities [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 29 | 29 |
Assets at Fair Value (Level 3) [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 78 | 72 |
Assets at Fair Value (Level 3) [Member] | United States [Member] | Private Equity and Hedge Funds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 52 | 52 |
Assets at Fair Value (Level 3) [Member] | International [Member] | Short-Term and Other Investments [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | 15 | 13 |
Assets at Fair Value (Level 3) [Member] | International [Member] | Private Equity and Hedge Funds [Member] |  |  |
Pension Plans, Postretirement and Other Employee Benefits [Line Items] |  |  |
Total Assets at Fair Value | $ 11 | $ 7 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 d(iv)(b)(i) -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 b -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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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