Retirement Plans and Other Retiree Benefits (Details 4) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Effect of one percentage point increase on accumulated postretirement benefit obligation	$ 119
Effect of one percentage point increase on service and interest cost	9
Effect of one percentage point decrease on accumulated postretirement benefit obligation	(96)
Effect of one percentage point decrease on service and interest cost	$ (7)
Other post-retirement plan, benefit obligation, percent decrease due to expected mortality update in the current year	2.00%	2.00%
United States Pension Plan of US Entity
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, benefit obligation, percent decrease due to expected mortality update in current year	1.00%	1.00%

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

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- Definition

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

+ References

No definition available.

+ Details

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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=65897934&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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