Retirement Plans and Other Retiree Benefits (Details 4) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Other Retiree Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Effect of one percentage point increase on accumulated postretirement benefit obligation	$ 120
Effect of one percentage point increase on service and interest cost	10
Effect of one percentage point decrease on accumulated postretirement benefit obligation	(96)
Effect of one percentage point decrease on service and interest cost	$ (8)
Other Post-Retirement Plan, Benefit Obligation, Percentage Increase Due To Expected Mortality Update In The Current Year	2.00%	9.00%
United States Pension Plan of US Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Percentage Increase Due To Expected Mortality Update In The Current Year	1.00%	6.00%

Defined Benefit Plan, Benefit Obligation, Percentage Increase Due To Expected Mortality Update In The Current Year

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- Definition

Other Post-Retirement Plan, Benefit Obligation, Percentage Increase Due To Expected Mortality Update In The Current Year

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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.

+ 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 (m)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

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.

+ References

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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.

+ References

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- Definition

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.

+ References

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