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Retirement Benefits and Trusteed Assets (Pension Plan - Benefits related to Qualified and Nonqualified Pension Plans Expected to be paid in the Next Ten Years) (Details) (Pension Plan, Defined Benefit [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Pension Plan, Defined Benefit [Member]
 
Pension Benefits to be Paid Over the Next 5 Years and Thereafter [Line Items]  
Defined Benefit Plan, Expected Future Benefit Payments in next twelve months $ 242
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 250
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 258
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 268
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 280
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 1,529
Total Defined Benefit Pension Plan Expected Future Payments $ 2,827