Retirement Plans (Schedule Of Estimated Net Actuarial Loss And Prior Service Cost For The Pension And Other Postretirement Plans That Will Be Amortized From Accumulated Other Comprehensive Income Into Net Periodic Benefit Cost During 2011) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 24
Prior service cost (credit)	3
Total	27
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(1)
Prior service cost (credit)	(1)
Total	$ (2)

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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