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Subsequent Events Subsequent Events (Details) (Pension Plans [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2014
International Association of Machinists and Aerospace Workers District 751 Extension [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]        
Pension curtailment charges/costs $ 104 $ 25 $ 64 $ 140
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease)       $ (130)