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Pension and Other Postretirement Benefit Plans (Obligations and Funded Status at End of Year) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
United States Pension Benefits
Funded status
Fair value of plan assets	$ 2,664	$ 2,741	$ 3,042
Benefit obligations	3,415	3,470	3,796
Funded status	(751)	(729)
Amounts recognized in the consolidated balance sheet
Noncurrent asset	0	0
Current liability	(14)	(10)
Noncurrent liability	(737)	(719)
Amount recognized	(751)	(729)
Amounts recognized in accumulated other comprehensive loss (pre-tax)
Net actuarial loss	1,426	1,404
Prior service (credit) cost	(7)	(11)
Amount recognized	1,419	1,393
Foreign Pension Benefits
Funded status
Fair value of plan assets	510	552	640
Benefit obligations	855	865	1,026
Funded status	(345)	(313)
Amounts recognized in the consolidated balance sheet
Noncurrent asset	2	5
Current liability	(10)	(12)
Noncurrent liability	(337)	(306)
Amount recognized	(345)	(313)
Amounts recognized in accumulated other comprehensive loss (pre-tax)
Net actuarial loss	176	99
Prior service (credit) cost	(3)	(3)
Amount recognized	173	96
Other Postretirement Benefits
Funded status
Fair value of plan assets	0	0	0
Benefit obligations	376	441	$ 502
Funded status	(376)	(441)
Amounts recognized in the consolidated balance sheet
Noncurrent asset	0	0
Current liability	(42)	(51)
Noncurrent liability	(334)	(390)
Amount recognized	(376)	(441)
Amounts recognized in accumulated other comprehensive loss (pre-tax)
Net actuarial loss	3	20
Prior service (credit) cost	(40)	(25)
Amount recognized	$ (37)	$ (5)

X

- Definition

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to 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.

+ References

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- Definition

Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Prior Service Cost
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- Definition

The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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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.

+ References

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

+ References

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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.

+ References

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-Publisher FASB
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- Definition

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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