Pension, Other Postretirement Benefits and Savings Plans (Change in Benefit Obligation and Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Curtailments/Settlements	$ 39	$ 0	$ 0
U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	2,981	2,837
Service cost	(15)	(45)	(39)
Interest cost	(256)	(243)	(261)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	4,800
Ending balance	6,250	4,800
Defined Benefit Plan, Funded Status of Plan	(257)	(1,181)
Prior service cost (credit)	(4)	31
Net actuarial loss	2,985	2,806
Deferred income taxes	(177)	(125)
Minority shareholders' equity	(62)	(57)
Net amount recognized	2,742	2,655
Hourly United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percent of Obligation Covered by Interest Rate Swaptions		55.00%
Ending balance		(4,000)
Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	858	988
Service cost	(34)	(39)	(31)
Interest cost	(131)	(131)	(143)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,455
Ending balance	2,721	2,455
Defined Benefit Plan, Funded Status of Plan	(457)	(674)
Prior service cost (credit)	4	7
Net actuarial loss	854	981
Deferred income taxes	(141)	(120)
Minority shareholders' equity	(109)	(153)
Net amount recognized	608	715
Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(53)	(93)
Service cost	(4)	(6)	(6)
Interest cost	(19)	(19)	(24)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Funded Status of Plan	(356)	(383)
Prior service cost (credit)	(152)	(199)
Net actuarial loss	99	106
Deferred income taxes	(1)	12
Minority shareholders' equity	1	1
Net amount recognized	(53)	(80)
U.S. Other Postretirement Benefit Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Funded Status of Plan	(190)	(206)
Non-U.S. Other Postretirement Benefit Plans
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Funded Status of Plan	(166)	(177)
Change in Benefit Obligation \| U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Beginning balance	(5,981)	(6,756)
Newly adopted plans	0	0
Service cost	(15)	(45)
Interest cost	(256)	(243)
Plan amendments	1	30
Actuarial (loss) gain	(693)	605
Participant Contributions	0	0
Curtailments/Settlements	1	0
Foreign currency translation	0	0
Benefit payments	436	428
Ending balance	(6,507)	(5,981)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Participant Contributions	0	0
Benefit payments	(436)	(428)
Change in Benefit Obligation \| Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Beginning balance	(3,129)	(3,220)
Newly adopted plans	(3)	(3)
Service cost	(34)	(39)
Interest cost	(131)	(131)
Plan amendments	(2)	1
Actuarial (loss) gain	(394)	89
Participant Contributions	(2)	(2)
Curtailments/Settlements	69	13
Foreign currency translation	284	18
Benefit payments	164	145
Ending balance	(3,178)	(3,129)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Participant Contributions	2	2
Benefit payments	(164)	(145)
Change in Benefit Obligation \| Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Beginning balance	(388)	(474)
Newly adopted plans	0	0
Service cost	(4)	(6)
Interest cost	(19)	(19)
Plan amendments	0	0
Actuarial (loss) gain	0	50
Participant Contributions	(16)	(16)
Curtailments/Settlements	0	0
Foreign currency translation	17	21
Benefit payments	49	56
Ending balance	(361)	(388)
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Participant Contributions	16	16
Benefit payments	(49)	(56)
Change In Plan Assets \| U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Participant Contributions	0	0
Benefit payments	436	428
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	4,800	4,100
Actual return on plan assets	711	104
Company contributions to plan assets	1,167	1,016
Cash funding of direct participant payments	9	8
Participant Contributions	0	0
Settlements	(1)	0
Foreign currency translation	0	0
Benefit payments	(436)	(428)
Ending balance	6,250	4,800
Change In Plan Assets \| Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Participant Contributions	(2)	(2)
Benefit payments	164	145
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,455	2,354
Actual return on plan assets	505	140
Company contributions to plan assets	118	111
Cash funding of direct participant payments	44	27
Participant Contributions	2	2
Settlements	(39)	(13)
Foreign currency translation	(200)	(21)
Benefit payments	(164)	(145)
Ending balance	2,721	2,455
Change In Plan Assets \| Other Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Participant Contributions	(16)	(16)
Benefit payments	49	56
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	5	6
Actual return on plan assets	0	0
Company contributions to plan assets	2	2
Cash funding of direct participant payments	31	38
Participant Contributions	16	16
Settlements	0	0
Foreign currency translation	0	(1)
Benefit payments	(49)	(56)
Ending balance	5	5
Certain Unfunded Non US Subsidiaries
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	132	73
Ending balance	$ (348)	$ (352)

Cash Funding Of Direct Participant Payments

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Curtailments The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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Defined Benefit Plans Newly Adopted Plans, Benefit Obligation

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Other Comprehensive Income Loss Minority Sharesholders Equity Net Of Tax

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Other Comprehensive Income Loss Pension and Other Postretirement Benefit Plans Net Amount Recognized

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Percent of Obligation Covered by Interest Rate Swaptions

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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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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.

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-SubTopic 10

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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 difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Publisher FASB

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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-Glossary Gain or Loss

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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.

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-Glossary Projected Benefit Obligation

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-Glossary Accumulated Postretirement Benefit Obligation

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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-Glossary Postretirement Benefits

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

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- Definition

The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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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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- Definition

Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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- Definition

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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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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-Name Accounting Standards Codification

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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-Glossary Service Cost (Component of Net Periodic Pension Cost)

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- Definition

The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

+ References

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-Subparagraph (a)(1)

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- Definition

Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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-Paragraph 12

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