Pension and Other Postretirement Benefits (Details) (USD $)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Amounts Recognized on the Balance Sheet:
Noncurrent liabilities	$ (2,823,000,000)	$ (1,868,000,000)
Pensions
Change in benefit obligation:
Benefit obligation, beginning of period	5,858,000,000	5,392,000,000
Liabilities assumed with Allegheny Merger	1,341,000,000	0
Service cost	130,000,000	99,000,000	91,000,000
Interest cost	374,000,000	314,000,000	317,000,000
Plan participants' contributions	0	0
Plan amendments	0	16,000,000
Special termination benefits	6,000,000	0
Medicare retiree drug subsidy	0	0
Actuarial (gain) loss	647,000,000	343,000,000
Benefits paid	(379,000,000)	(306,000,000)
Benefit obligation, end of period	7,977,000,000	5,858,000,000	5,392,000,000
Change in fair value of plan assets:
Fair value of plan assets, beginning of period	4,544,000,000	4,399,000,000
Assets assumed with Allegheny Merger	954,000,000	0
Actual return on plan assets	364,000,000	440,000,000
Company contributions	384,000,000	11,000,000
Plan participants' contributions	0	0
Benefits paid	(379,000,000)	(306,000,000)
Fair value of plan assets, end of period	5,867,000,000	4,544,000,000	4,399,000,000
Funded Status:
Funded Status	(2,110,000,000)	(1,314,000,000)
Accumulated benefit obligation	7,409,000,000	5,469,000,000
Amounts Recognized on the Balance Sheet:
Current liabilities	(13,000,000)	(11,000,000)
Noncurrent liabilities	(2,097,000,000)	(1,303,000,000)
Net liability as of December 31	(2,110,000,000)	(1,314,000,000)
Amounts Recognized in AOCI:
Prior service cost (credit)	67,000,000	76,000,000
Assumptions Used to Determine Benefit Obligations
Discount rate	5.00%	5.50%
Rate of compensation increase	5.20%	5.20%
Allocation of Plan Assets
Equity securities	19.00%	28.00%
Bonds	48.00%	50.00%
Absolute return strategies	21.00%	11.00%
Real estate	6.00%	6.00%
Private Equities	2.00%	4.00%
Cash	4.00%	1.00%
Total	100.00%	100.00%
Pensions \| Qualified Plan
Funded Status:
Funded Status	(1,820,000,000)	(1,076,000,000)
Pensions \| Non-qualified Plans
Funded Status:
Funded Status	(290,000,000)	(238,000,000)
OPEB
Change in benefit obligation:
Benefit obligation, beginning of period	861,000,000	823,000,000
Liabilities assumed with Allegheny Merger	272,000,000	0
Service cost	13,000,000	10,000,000	12,000,000
Interest cost	48,000,000	45,000,000	64,000,000
Plan participants' contributions	39,000,000	30,000,000
Plan amendments	(98,000,000)	0
Special termination benefits	0	0
Medicare retiree drug subsidy	9,000,000	7,000,000
Actuarial (gain) loss	19,000,000	56,000,000
Benefits paid	(126,000,000)	(110,000,000)
Benefit obligation, end of period	1,037,000,000	861,000,000	823,000,000
Change in fair value of plan assets:
Fair value of plan assets, beginning of period	498,000,000	467,000,000
Assets assumed with Allegheny Merger	75,000,000	0
Actual return on plan assets	23,000,000	52,000,000
Company contributions	19,000,000	59,000,000
Plan participants' contributions	39,000,000	30,000,000
Benefits paid	(126,000,000)	(110,000,000)
Fair value of plan assets, end of period	528,000,000	498,000,000	467,000,000
Funded Status:
Funded Status	(509,000,000)	(363,000,000)
Accumulated benefit obligation	0	0
Amounts Recognized on the Balance Sheet:
Current liabilities	0	0
Noncurrent liabilities	(509,000,000)	(363,000,000)
Net liability as of December 31	(509,000,000)	(363,000,000)
Amounts Recognized in AOCI:
Prior service cost (credit)	$ (847,000,000)	$ (952,000,000)
Assumptions Used to Determine Benefit Obligations
Discount rate	4.75%	5.00%
Rate of compensation increase	5.20%	5.20%
Allocation of Plan Assets
Equity securities	38.00%	47.00%
Bonds	44.00%	45.00%
Absolute return strategies	13.00%	3.00%
Real estate	1.00%	2.00%
Private Equities	0.00%	1.00%
Cash	4.00%	2.00%
Total	100.00%	100.00%

Defined Benefit Plan Absolute Return Strategies.

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Defined Benefit Plan Private Equities.

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- Definition

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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The net increase or decrease of 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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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 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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The amount of increase in the benefit obligation attributed to business combinations.

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The amount of increase in the plan assets attributed to a business combination.

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

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