Pension and Other Postemployment Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amounts Recognized on the Balance Sheet:
Noncurrent liabilities	$ (3,080)	$ (2,823)
Pensions
Change in benefit obligation:
Benefit obligation, beginning of period	7,977	5,858
Liabilities assumed with Allegheny Merger	0	1,341
Service cost	161	130	99
Interest cost	389	374	314
Plan participants' contributions	0	0
Plan amendments	8	0
Special termination benefits	0	6
Medicare retiree drug subsidy	0	0
Actuarial (gain) loss	861	647
Benefits paid	(421)	(379)
Benefit obligation, end of period	8,975	7,977	5,858
Change in fair value of plan assets:
Fair value of plan assets, beginning of period	5,867	4,544
Assets assumed with Allegheny Merger	0	954
Actual return on plan assets	611	364
Company contributions	614	384
Plan participants' contributions	0	0
Benefits paid	(421)	(379)
Fair value of plan assets, end of period	6,671	5,867	4,544
Funded Status:
Funded Status	(2,303)	(2,110)
Accumulated benefit obligation	8,355	7,409
Amounts Recognized on the Balance Sheet:
Current liabilities	(14)	(13)
Noncurrent liabilities	(2,289)	(2,097)
Net liability as of December 31	(2,303)	(2,110)
Amounts Recognized in AOCI:
Prior service cost (credit)	58	67
Assumptions Used to Determine Benefit Obligations
Discount rate	4.25%	5.00%
Rate of compensation increase	4.70%	5.20%
Allocation of Plan Assets
Asset Allocation	100.00%	100.00%
Pensions \| Equity securities
Allocation of Plan Assets
Asset Allocation	15.00%	19.00%
Pensions \| Bonds
Allocation of Plan Assets
Asset Allocation	47.00%	48.00%
Pensions \| Absolute return strategies
Allocation of Plan Assets
Asset Allocation	22.00%	21.00%
Pensions \| Real estate
Allocation of Plan Assets
Asset Allocation	5.00%	6.00%
Pensions \| Private equities
Allocation of Plan Assets
Asset Allocation	1.00%	2.00%
Pensions \| Cash
Allocation of Plan Assets
Asset Allocation	10.00%	4.00%
Pensions \| Qualified Plan
Change in fair value of plan assets:
Company contributions	600
Funded Status:
Funded Status	(1,967)	(1,820)
Pensions \| Non-qualified Plans
Funded Status:
Funded Status	(336)	(290)
OPEB
Change in benefit obligation:
Benefit obligation, beginning of period	1,037	861
Liabilities assumed with Allegheny Merger	0	272
Service cost	12	13	10
Interest cost	47	48	45
Plan participants' contributions	17	39
Plan amendments	(85)	(98)
Special termination benefits	0	0
Medicare retiree drug subsidy	0	9
Actuarial (gain) loss	152	19
Benefits paid	(104)	(126)
Benefit obligation, end of period	1,076	1,037	861
Change in fair value of plan assets:
Fair value of plan assets, beginning of period	528	498
Assets assumed with Allegheny Merger	0	75
Actual return on plan assets	48	23
Company contributions	19	19
Plan participants' contributions	17	39
Benefits paid	(104)	(126)
Fair value of plan assets, end of period	508	528	498
Funded Status:
Funded Status	(566)	(509)
Accumulated benefit obligation	0	0
Amounts Recognized on the Balance Sheet:
Current liabilities	45	0
Noncurrent liabilities	(611)	(509)
Net liability as of December 31	(566)	(509)
Amounts Recognized in AOCI:
Prior service cost (credit)	$ (728)	$ (847)
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)	5.00%	5.00%
Allocation of Plan Assets
Asset Allocation	100.00%	100.00%
OPEB \| Equity securities
Allocation of Plan Assets
Asset Allocation	39.00%	38.00%
OPEB \| Bonds
Allocation of Plan Assets
Asset Allocation	40.00%	44.00%
OPEB \| Absolute return strategies
Allocation of Plan Assets
Asset Allocation	4.00%	13.00%
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	16.00%	4.00%
OPEB \| Pre Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed	7.50%	7.50%
Year that the rate reaches the ultimate trend rate	2020	2016
OPEB \| Post Medicare
Assumptions Used to Determine Benefit Obligations
Health care cost trend rate assumed	8.00%	8.50%
Year that the rate reaches the ultimate trend rate	2020	2018

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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 amount of increase in the benefit obligation attributed to business combinations.

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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 amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.

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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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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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