Retirement Benefits (Schedule Of Amounts Recognized In Other Comprehensive Loss) (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]
Prior service cost (credit)	$ (130)	$ (138)	$ (136)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	4,179	3,052
Prior service cost (credit)	68	81
Amounts recognized in other comprehensive loss	4,247	3,133
Retiree Medical And Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(181)	(128)
Prior service cost (credit)	(179)	(205)
Amounts recognized in other comprehensive loss	$ (360)	$ (333)

The aggregate net gain (loss) recognized in other comprehensive income, including amounts arising during the period and reclassification adjustments of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period.

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The aggregate net prior service cost or credit recognized in other comprehensive income, including amounts arising during the period and reclassification adjustments of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period.

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- Definition

The change in other comprehensive income due to the amortization of the net prior service costs (credit) into net periodic pension costs.

+ References

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

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+ Details