Pension and Other Postretirement Benefit Plans (Obligations and Funded Status at End of Year) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 3,682,000,000	$ 3,041,000,000
United States Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	3,042,000,000	2,835,000,000	2,790,000,000
Benefit obligations	3,796,000,000	3,546,000,000	4,196,000,000
Funded status	(754,000,000)	(711,000,000)
Noncurrent asset	0	0
Current liability	(9,000,000)	(7,000,000)
Noncurrent liability	(745,000,000)	(704,000,000)
Amount recognized	(754,000,000)	(711,000,000)
Net actuarial loss	1,368,000,000	1,215,000,000
Prior service (credit) cost	(14,000,000)	(17,000,000)
Amount recognized	1,354,000,000	1,198,000,000
Foreign Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	640,000,000	206,000,000	197,000,000
Benefit obligations	1,026,000,000	439,000,000	448,000,000
Funded status	(386,000,000)	(233,000,000)
Noncurrent asset	8,000,000	7,000,000
Current liability	(16,000,000)	(14,000,000)
Noncurrent liability	(378,000,000)	(226,000,000)
Amount recognized	(386,000,000)	(233,000,000)
Net actuarial loss	118,000,000	98,000,000
Prior service (credit) cost	0	3,000,000
Amount recognized	118,000,000	101,000,000
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0	0	0
Benefit obligations	502,000,000	509,000,000	477,000,000
Funded status	(502,000,000)	(509,000,000)
Noncurrent asset	0	0
Current liability	(56,000,000)	(51,000,000)
Noncurrent liability	(446,000,000)	(458,000,000)
Amount recognized	(502,000,000)	(509,000,000)
Net actuarial loss	53,000,000	42,000,000
Prior service (credit) cost	(120,000,000)	(169,000,000)
Amount recognized	$ (67,000,000)	$ (127,000,000)

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.

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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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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.

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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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- Definition

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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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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-Glossary Projected Benefit Obligation

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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.

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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.

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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.

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-Glossary Current Liabilities

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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.

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