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) |