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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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- Details

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X

- 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

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