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Postretirement Plans (Narrative) (Details) (Pension Plans, Defined Benefit [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Pension Curtailment charge $ 338 $ 20  
Defined Benefit Plan, Benefit Obligation Discount Rate 4.50%   4.80%
defined benefit plan changes [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Union and nonunion participants transitioned to defined contribution plan 100,000    
Pension Curtailment charge 334    
Pension Benefit Plans, Net Actuarial Gain, before Tax recorded in Other Comprehensive Income 966    
Defined Benefit Plan Curtailment 1,988    
Defined Benefit Plan, Net Actuarial Gain (Loss) $ 1,022