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Retirement Benefits (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]  
Required contributions $ 168
AA [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Required contributions 168
Pension Plans [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions 613
Pension Plans [Member] | AA [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Employer contributions $ 613