Restructuring Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]    
Restructuring $ 16 $ 21
Restructuring, Cash Expenditures 40 46
Discontinued Operations | Thermal Systems    
Restructuring Cost and Reserve [Line Items]    
Restructuring $ 1 $ 1