Employee Benefits Schedule of Defined Benefit Plan Disclosures (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Benefit payments	$ (16)us-gaap_DefinedBenefitPlanBenefitsPaid
As of January 1	596			591
Noncurrent asset	(32)us-gaap_AssetsHeldInTrustNoncurrent	(35)us-gaap_AssetsHeldInTrustNoncurrent
Noncurrent liability	(237)	(154)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
As of January 1	777	705	728
Service cost	15	17	14
Interest cost on benefit obligation	34	30	31
Participants’ contributions	0	0
Actuarial loss (gain)	72	(38)
Defined Benefit Plan, Special Termination Benefits	0	0
Benefit payments	(48)	(32)
Defined Benefit Plan, Administration Expenses	(1)	0
As of January 1	596	537		591
Unfunded position as of December 31	186	109
Net actuarial loss (gain) included in comprehensive income	67	(89)
Defined Benefit Plan, Amortization of Gains (Losses)	(17)	(24)	(17)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0
Total Amounts included in comprehensive income	50	(113)
Defined Benefit Plan, Accumulated Benefit Obligation	691	631
Actual return on plan assets	44	91
Company contributions	0	0
Noncurrent asset	0	0
Current liability	0	0
Noncurrent liability	(186)	(109)
Net actuarial loss	236	186
Prior service cost	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	236	186
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate	4.02%	4.84%
Discount rate used to calculate benefit obligation	4.84%	4.24%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase	3.65%	3.65%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.65%	3.65%
Long-term rate of return on plan assets	7.50%	7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.50%	8.25%
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
As of January 1	83	77	84
Service cost	2	2	2
Interest cost on benefit obligation	4	3	3
Participants’ contributions	1	2
Actuarial loss (gain)	4	(9)
Defined Benefit Plan, Special Termination Benefits	1	1
Benefit payments	(6)	(6)
Defined Benefit Plan, Administration Expenses	0	0
As of January 1	32	28		32
Unfunded position as of December 31	51	45
Net actuarial loss (gain) included in comprehensive income	5	(11)
Defined Benefit Plan, Amortization of Gains (Losses)	(1)	(1)	(1)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(1)	(1)	(1)
Total Amounts included in comprehensive income	3	(13)
Actual return on plan assets	1	5
Company contributions	4	3
Noncurrent asset	0	0
Current liability	0	0
Noncurrent liability	(51)	(45)
Net actuarial loss	10	6
Prior service cost	1	2
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	11	8
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate	3.07%	3.46%
Defined Benefit Plan Discount rate - upper range	4.10%	4.96%
Discount rate used to calculate benefit obligation	3.46%	2.77%
Defined Benefit Plan Cost Discount rate - upper range	4.96%	4.13%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Rate of Compensation Increase	4.58%	4.58%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	4.58%	4.58%
Long-term rate of return on plan assets	6.37%	6.46%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	6.46%	5.89%
Non Qualified Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
As of January 1	27	24	27
Service cost	0	0	0
Interest cost on benefit obligation	1	1	1
Participants’ contributions	0	0
Actuarial loss (gain)	5	(2)
Defined Benefit Plan, Special Termination Benefits	0	0
Benefit payments	(3)	(2)
Defined Benefit Plan, Administration Expenses	0	0
As of January 1	16	15		15
Unfunded position as of December 31	12	8
Net actuarial loss (gain) included in comprehensive income	5	(1)
Defined Benefit Plan, Amortization of Gains (Losses)	(1)	(1)	(1)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	0
Total Amounts included in comprehensive income	4	(2)
Defined Benefit Plan, Accumulated Benefit Obligation	27	24
Actual return on plan assets	1	3
Company contributions	1	0
Noncurrent asset	(15)	(16)
Current liability	(2)	(2)
Noncurrent liability	(25)	(22)
Net actuarial loss	13	9
Prior service cost	0	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ 13	$ 9
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate	4.02%	4.84%
Discount rate used to calculate benefit obligation	4.84%	4.24%

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, Discount Rate

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Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Obligation, rate of Compensation Increase

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Defined Benefit Plan Cost Discount rate - upper range

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The interest rate used to adjust for the time value of money for the Defiend Benefit Plan Discount rate - upper range.

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Long-term rate of return on plan assets

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Net actuarial loss from Defined Benefit Plans included in Accumulated Other Comprehensive Income.

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No definition available.

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The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.included in comprehensive income

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No definition available.

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Total Amounts included in comprehensive income during the period from Defined Benefit Plans.

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No definition available.

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The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(b))

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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-Name Accounting Standards Codification

-Glossary Accumulated Benefit Obligation

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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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

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-Name Accounting Standards Codification

-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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-Topic 715

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-Glossary Gain or Loss

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- Definition

Amount of plan administration expenses deducted from total plan assets.

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The amount of gains or losses recognized in net periodic benefit cost.

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Amount before tax, after reclassification adjustments, of prior service cost (credit) that has not been recognized in the income statement.

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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.

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-Paragraph 1

-Subparagraph (k)(3)

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- Definition

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

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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-Glossary Projected Benefit Obligation

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-Glossary Accumulated Postretirement Benefit Obligation

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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-Glossary Postretirement Benefits

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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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.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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-Glossary Service Cost (Component of Net Periodic Pension Cost)

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The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.

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Amount after tax and reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (i-k)

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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-Glossary Current Liabilities

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-Paragraph 1

-Subparagraph (c)

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

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