Retirement Benefits (Status Of The Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Fair value at January 1	$ 170
Company contributions	489	157
Fair value at December 31	155	170
Postretirement Health Care Benefits Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at January 1	447	461
Service cost	4	6	6
Interest cost	22	23	27
Actuarial gain	0	(17)
Benefit payments	(23)	(26)
Benefit obligation at December 31	450	447	461
Fair value at January 1	170	174
Return on plan assets	7	20
Company contributions	0	0
Benefit payments made with plan assets	(22)	(24)
Fair value at December 31	155	170	174
Funded status of the plan	(295)	(277)
Unrecognized net loss	202	204
Medicare Part D	0	18
Unrecognized prior service cost	0	(1)
Accrued postretirement health care cost	$ (93)	$ (74)

Benefit payments made with plan assets

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Permanent Tax Difference Related To Health Care Plan Subsidies

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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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Disclosure under FAS 132R, before it was amended by FAS 158, of the cumulative net gain (loss) that has not yet been recognized as a part of net periodic benefit cost.

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Disclosure under FAS 132R, before it was amended by FAS 158, of the portion of prior service costs and credits, due to 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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Disclosure under FAS 132R, before it was amended by FAS 158, of prepaid benefit costs, if any, as one of the amounts recognized in the balance sheet prior to the adoption of the recognition provisions of FAS 158.

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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 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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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 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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