EBP Key Assumptions (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Weighted average assumptions utilized to determine net periodic benefit cost
Health care cost trend rate assumed for next fiscal year	7.20%
Direction and pattern of change for assumed health care cost trend rate	decreases
Ultimate health care cost trend rate	5.00%
Year that rate reaches ultimate trend rate	2023
One percentage point change in assumed health care cost trend rates effects
Effect on total of service and interest cost components, Point increase	$ 1
Effect on total of service and interest cost components, Point decrease	(1)
Effect on other postretirement benefit obligation, Point increase	7
Effect on other postretirement benefit obligation, Point decrease	$ (6)
Pension Benefits [Member]
Weighted average assumptions utilized to determine benefit obligations
Discount rate	4.68%	3.43%
Rate of compensation increase	4.56%	4.57%
Weighted average assumptions utilized to determine net periodic benefit cost
Discount rate	3.43%	3.98%	5.19%
Expected long-term rate of return on plan assets	5.90%	6.30%	7.50%
Rate of compensation increase	4.57%	4.52%	5.00%
Other Postretirement Benefits [Member]
Weighted average assumptions utilized to determine benefit obligations
Discount rate	4.80%	3.77%
Weighted average assumptions utilized to determine net periodic benefit cost
Discount rate	3.97%	4.22%	5.35%
Expected long-term rate of return on plan assets	5.26%	5.71%	6.54%

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

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- Definition

Expected rate of compensation increases (for pay-related plans).

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- Definition

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

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(3)

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

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- Definition

Expected rate of compensation increases (for pay-related plans).

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- Definition

A general description of the direction and pattern of change in the assumed trend rate(s) starting after one year from the current statement of financial position date.

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- Definition

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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- Definition

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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The effect of a one-percentage-point increase 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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- Definition

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

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- Definition

The ultimate trend rate for health care costs.

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- Definition

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

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