Pension and Other Postemployment Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amounts Recognized on the Balance Sheet:
Noncurrent liabilities	$ (3,932)	$ (2,689)
Pensions
Change in benefit obligation:
Benefit obligation as of January 1	8,263	8,975
Service cost	167	197	161
Interest cost	402	372	389
Plan participants' contributions	0	0
Plan amendments	5	2
Medicare retiree drug subsidy	0	0
Actuarial (gain) loss	1,123	(846)
Benefits paid	(711)	(437)
Benefit obligation as of December 31	9,249	8,263	8,975
Change in fair value of plan assets:
Fair value of plan assets as of January 1	6,171	6,671
Actual return on plan assets	349	(77)
Company contributions	15	14
Plan participants' contributions	0	0
Benefits paid	(711)	(437)
Fair value of plan assets as of December 31	5,824	6,171	6,671
Funded Status:
Funded Status	(3,425)	(2,092)
Accumulated benefit obligation	8,744	7,800
Amounts Recognized on the Balance Sheet:
Current liabilities	(17)	(15)
Noncurrent liabilities	(3,408)	(2,077)
Net liability as of December 31	(3,425)	(2,092)
Amounts Recognized in AOCI:
Prior service cost (credit)	45	48
Assumptions Used to Determine Benefit Obligations
Discount rate	4.25%	5.00%
Rate of compensation increase	4.20%	4.20%
Allocation of Plan Assets
Asset Allocation	100.00%	100.00%
Pensions \| Equity securities
Allocation of Plan Assets
Asset Allocation	36.00%	18.00%
Pensions \| Bonds
Allocation of Plan Assets
Asset Allocation	33.00%	40.00%
Pensions \| Absolute return strategies
Allocation of Plan Assets
Asset Allocation	14.00%	23.00%
Pensions \| Real estate
Allocation of Plan Assets
Asset Allocation	7.00%	6.00%
Pensions \| Derivatives
Allocation of Plan Assets
Asset Allocation	1.00%	0.00%
Pensions \| Cash
Allocation of Plan Assets
Asset Allocation	9.00%	13.00%
Pensions \| Qualified Plan
Funded Status:
Funded Status	(3,064)	(1,782)
Pensions \| Non-qualified Plans
Funded Status:
Funded Status	(361)	(310)
OPEB
Change in benefit obligation:
Benefit obligation as of January 1	879	1,076
Service cost	9	13	12
Interest cost	39	37	47
Plan participants' contributions	16	15
Plan amendments	(97)	(37)
Medicare retiree drug subsidy	0	5
Actuarial (gain) loss	13	(107)
Benefits paid	(102)	(123)
Benefit obligation as of December 31	757	879	1,076
Change in fair value of plan assets:
Fair value of plan assets as of January 1	495	508
Actual return on plan assets	38	56
Company contributions	17	39
Plan participants' contributions	16	15
Benefits paid	(102)	(123)
Fair value of plan assets as of December 31	464	495	508
Funded Status:
Funded Status	(293)	(384)
Accumulated benefit obligation	0	0
Amounts Recognized on the Balance Sheet:
Current liabilities	0	0
Noncurrent liabilities	(293)	(384)
Net liability as of December 31	(293)	(384)
Amounts Recognized in AOCI:
Prior service cost (credit)	$ (479)	$ (558)
Assumptions Used to Determine Benefit Obligations
Discount rate	4.00%	4.75%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50%	5.00%
Allocation of Plan Assets
Asset Allocation	100.00%	100.00%
OPEB \| Equity securities
Allocation of Plan Assets
Asset Allocation	49.00%	47.00%
OPEB \| Bonds
Allocation of Plan Assets
Asset Allocation	40.00%	40.00%
OPEB \| Absolute return strategies
Allocation of Plan Assets
Asset Allocation	1.00%	3.00%
OPEB \| Real estate
Allocation of Plan Assets
Asset Allocation	1.00%	1.00%
OPEB \| Derivatives
Allocation of Plan Assets
Asset Allocation	0.00%	0.00%
OPEB \| Cash
Allocation of Plan Assets
Asset Allocation	9.00%	9.00%
OPEB \| Pre Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed	7.00%	7.25%
Year that the rate reaches the ultimate trend rate	2026	2020
OPEB \| Post Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed	7.50%	7.75%
Year that the rate reaches the ultimate trend rate	2026	2020

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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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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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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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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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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

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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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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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Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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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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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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The ultimate trend rate for health care costs.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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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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This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.24)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919

+ Details

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- Details

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- Details

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