Pension and Other Postretirement Employee Benefit Plans (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
U S Defined Benefit Pension And OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 16,700,000,000	$ 16,500,000,000
Pension plans, Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,700,000,000	3,700,000,000
U.S. non-qualified defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit pension plan, non-U.S., expected contribution	33,000,000
Non-U.S. defined benefit pension
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in next fiscal year	47,000,000
OPEB plans
Defined Benefit Plan Disclosure [Line Items]
Estimated future employer contributions in next fiscal year	$ 2,000,000

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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.

+ 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 (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

+ Details

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ Details

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

+ Details

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