v2.4.0.6

Retirement Benefits Plans - Other Postretirement Benefits Plan Assumptions (Details 8) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Effect on total service and interest cost, 1% increase	1
Effect on total service and interest cost, 1% decrease	(1)
Effect on other postretirement liabilities, 1% increase	22
Effect on other postretirement liabilities, 1% decrease	(20)
Other postretirement benefits plans [Member]
Assumptions used to determine benefit obligation at year-end
Discount rate	3.79%	4.60%	5.20%
Health care cost trend rate assumed for next year	6.96%	7.60%	8.10%
Ultimate health care cost trend rate	4.53%	4.50%	4.50%
Year ultimate health care cost trend rate is achieved	2022	2020	2020
Assumptions used to determine expense
Discount rate	4.60%	5.20%	5.70%
Initial health care cost trend rate	7.60%	8.10%	8.30%
Ultimate health care cost trend rate	4.50%	4.50%	4.75%
Year ultimate health care cost trend rate is achieved	2020	2020	2017

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- Definition

Assumptions used to determine expense initial health care cost trend rate.

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- Definition

Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate Assumptions Used To Determine Expense.

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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The interest rate used to adjust for the time value of money.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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+ References

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- Definition

The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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