Pensions Benefit Plans and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S Pension Plans
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	$ 2,275	$ 2,647
Change in benefit obligations:
Service cost	22	27	27
Interest cost	105	106	114
Actuarial (gain) loss, including the effect of change in discount rates	264	(234)
Curtailment, settlement, and plan amendment	(56)
Special termination		8	4
Benefit payments	(182)	(279)
Net change in benefit obligations	153	(372)
Obligations at end of year	2,428	2,275	2,647
Changes in fair value of pension plan assets
Fair value at beginning of year	2,273	2,175
Actual gain on plan assets	155	365
Benefit payments	(182)	(279)
Employer contributions		12
Settlements	(56)
Net change in fair value of assets	(83)	98
Fair value at end of year	2,190	2,273	2,175
Non-U.S. Pension Plans
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	1,866	1,911
Change in benefit obligations:
Service cost	23	33	26
Interest cost	69	72	77
Actuarial (gain) loss, including the effect of change in discount rates	131	(5)
Curtailment, settlement, and plan amendment	(567)	(52)
Participant contributions	5	7
Benefit payments	(91)	(101)
Foreign currency translation	(125)	1
Net change in benefit obligations	(555)	(45)
Obligations at end of year	1,311	1,866	1,911
Changes in fair value of pension plan assets
Fair value at beginning of year	1,578	1,527
Actual gain on plan assets	188	61
Benefit payments	(91)	(101)
Employer contributions	28	92
Participant contributions	5	7
Settlements	(519)
Foreign currency translation	(94)	(5)
Other	(1)	(3)
Net change in fair value of assets	(484)	51
Fair value at end of year	1,094	1,578	1,527
U.S Postretirement Benefit Plans
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	111	181
Change in benefit obligations:
Service cost		1	1
Interest cost	5	5	8
Actuarial (gain) loss, including the effect of change in discount rates	7	1
Benefit payments	(12)	(15)
Curtailment		(62)
Net change in benefit obligations		(70)
Obligations at end of year	111	111	181
Changes in fair value of pension plan assets
Benefit payments	(12)	(15)
Non-U.S. Postretirement Benefit Plans
Changes in the pension and postretirement benefit obligations
Obligations at beginning of year	90	102
Change in benefit obligations:
Service cost	1	1	1
Interest cost	4	4	4
Actuarial (gain) loss, including the effect of change in discount rates	(2)	(7)
Benefit payments	(3)	(4)
Other	(2)
Foreign currency translation	(7)	(6)
Net change in benefit obligations	(9)	(12)
Obligations at end of year	81	90	102
Changes in fair value of pension plan assets
Benefit payments	$ (3)	$ (4)

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates due to a curtailment, a settlement such as (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts, and plan amendment such as changing an existing plan or the initiation of a new plan.

+ References

No definition available.

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- Definition

This element represents the change in fair value of the pension plan assets as a result of other items not defined in the taxonomy.

+ References

No definition available.

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- Definition

The cost 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.

+ References

No definition available.

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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.

+ References

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

-Publisher FASB

-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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- Definition

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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-Name Accounting Standards Codification

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-Glossary Gain or Loss

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-Glossary Gain or Loss

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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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-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Accumulated Postretirement Benefit Obligation

-URI http://asc.fasb.org/extlink&oid=6503904

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- Definition

Net increase or decrease in the plan benefit obligation during the reporting period.

+ References

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Postretirement Benefits

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- Definition

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

+ References

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- Definition

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

+ References

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- Definition

The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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-Glossary Plan Curtailment

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-Paragraph 6

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- 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

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- Definition

The amount of increase or decrease in the fair value of plan assets during the reporting period.

+ References

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- Definition

Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

+ References

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

+ References

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- Definition

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.

+ References

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- Definition

Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements.

+ References

No definition available.

+ Details

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- Definition

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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- Definition

The amount that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

+ References

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