Pension and Other Postemployment Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amounts Recognized on the Balance Sheet:
Noncurrent liabilities	$ (2,689)	$ (3,080)
Pensions
Change in benefit obligation:
Benefit obligation as of January 1	8,975	7,977
Service cost	197	161	130
Interest cost	372	389	374
Plan participants' contributions	0	0
Plan amendments	2	8
Medicare retiree drug subsidy	0	0
Actuarial (gain) loss	(846)	861
Benefits paid	(437)	(421)
Benefit obligation as of December 31	8,263	8,975	7,977
Change in fair value of plan assets:
Fair value of plan assets as of January 1	6,671	5,867
Actual return on plan assets	(77)	611
Company contributions	14	614
Plan participants' contributions	0	0
Benefits paid	(437)	(421)
Fair value of plan assets as of December 31	6,171	6,671	5,867
Funded Status:
Funded Status	(2,092)	(2,303)
Accumulated benefit obligation	7,800	8,355
Amounts Recognized on the Balance Sheet:
Current liabilities	(15)	(14)
Noncurrent liabilities	(2,077)	(2,289)
Net liability as of December 31	(2,092)	(2,303)
Amounts Recognized in AOCI:
Prior service cost (credit)	48	58
Assumptions Used to Determine Benefit Obligations
Discount rate	5.00%	4.25%
Rate of compensation increase	4.20%	4.70%
Allocation of Plan Assets
Asset Allocation	100.00%	100.00%
Pensions \| Equity securities
Allocation of Plan Assets
Asset Allocation	18.00%	15.00%
Pensions \| Bonds
Allocation of Plan Assets
Asset Allocation	40.00%	47.00%
Pensions \| Absolute return strategies
Allocation of Plan Assets
Asset Allocation	23.00%	22.00%
Pensions \| Real estate
Allocation of Plan Assets
Asset Allocation	6.00%	5.00%
Pensions \| Private equities
Allocation of Plan Assets
Asset Allocation	0.00%	1.00%
Pensions \| Cash
Allocation of Plan Assets
Asset Allocation	13.00%	10.00%
Pensions \| Qualified Plan
Funded Status:
Funded Status	(1,782)	(1,967)
Pensions \| Non-qualified Plans
Funded Status:
Funded Status	(310)	(336)
OPEB
Change in benefit obligation:
Benefit obligation as of January 1	1,076	1,037
Service cost	13	12	13
Interest cost	37	47	48
Plan participants' contributions	15	17
Plan amendments	(37)	(85)
Medicare retiree drug subsidy	5	0
Actuarial (gain) loss	(107)	152
Benefits paid	(123)	(104)
Benefit obligation as of December 31	879	1,076	1,037
Change in fair value of plan assets:
Fair value of plan assets as of January 1	508	528
Actual return on plan assets	56	48
Company contributions	39	19
Plan participants' contributions	15	17
Benefits paid	(123)	(104)
Fair value of plan assets as of December 31	495	508	528
Funded Status:
Funded Status	(384)	(566)
Accumulated benefit obligation	0	0
Amounts Recognized on the Balance Sheet:
Current liabilities	0	0
Noncurrent liabilities	(384)	(566)
Net liability as of December 31	(384)	(566)
Amounts Recognized in AOCI:
Prior service cost (credit)	$ (558)	$ (728)
Assumptions Used to Determine Benefit Obligations
Discount rate	4.75%	4.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Allocation of Plan Assets
Asset Allocation	100.00%	100.00%
OPEB \| Equity securities
Allocation of Plan Assets
Asset Allocation	47.00%	39.00%
OPEB \| Bonds
Allocation of Plan Assets
Asset Allocation	40.00%	40.00%
OPEB \| Absolute return strategies
Allocation of Plan Assets
Asset Allocation	3.00%	4.00%
OPEB \| Real estate
Allocation of Plan Assets
Asset Allocation	1.00%	1.00%
OPEB \| Private equities
Allocation of Plan Assets
Asset Allocation	0.00%	0.00%
OPEB \| Cash
Allocation of Plan Assets
Asset Allocation	9.00%	16.00%
OPEB \| Pre Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed	7.25%	7.50%
Year that the rate reaches the ultimate trend rate	2020	2020
OPEB \| Post Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed	7.75%	8.00%
Year that the rate reaches the ultimate trend rate	2020	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) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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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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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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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 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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- Definition

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.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Name Accounting Standards Codification

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-SubTopic 30

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- Definition

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.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

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

-Publisher FASB

-Name Accounting Standards Codification

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

-URI http://asc.fasb.org/extlink&oid=6525008

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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-Paragraph 1

-Subparagraph (a)(1)

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- Definition

The ultimate trend rate for health care costs.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

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- Definition

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.

+ References

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

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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- Definition

For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

-URI http://asc.fasb.org/extlink&oid=6509677

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- Definition

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

+ References

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

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-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

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-Subparagraph (SX 210.7-03.15)

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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.

+ References

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