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Retirement Benefits (Schedule Of Potential Changes In Key Assumptions) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Pension Benefits [Member]
 
Service Cost and Interest Cost, .25% decrease in discount rate $ (2)
Benefit Obligation, .25% decrease in discount rate 110
Service Cost and Interest Cost, .25% increase in salary rate 2
Benefit Obligation, .25% increase in salary rate 14
Postretirement Benefits [Member]
 
Benefit Obligation, .25% decrease in discount rate 38
Service Cost and Interest Cost, 1.00% increase in annual medical trend 3
Benefit Obligation, 1.00% increase in annual medical trend 42
Service Cost and Interest Cost, 1.00% decrease in annual medical trend (3)
Benefit Obligation, 1.00% decrease in annual medical trend $ (41)