Employee Benefit Arrangements - Assumptions - Additional Information (Detail)	12 Months Ended
Dec. 31, 2012
Compensation And Retirement Disclosure [Abstract]
Health care cost trend rate, for next fiscal year	7.50%
Health care cost trend rate, decrease to percentage	6.00%
Health care cost trend rate, period over which rate equals ultimate trend rate	5 years
Health care cost trend rate, ultimate trend	5.00%

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (l)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Health Care Cost Trend Rate

-URI http://asc.fasb.org/extlink&oid=6514820

+ Details

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- Definition

The ultimate trend rate for health care costs.

+ References

+ Details

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- Definition

Defined Benefit Plan Period That Rate Reaches Ultimate Trend Rate

+ References

No definition available.

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- Definition

Defined Benefit Plan Ultimate Health Care Cost Trend Rate Decrease

+ References

No definition available.

+ Details

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