Pension and Postretirement Expense Level 4 (Details) - Amounts Recognized in Other Comprehensive Income (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax $ (77) $ 68 $ (108)
United States Pension Plans of US Entity, Defined Benefit [Member]      
Actuarial losses 17    
Prior Service Cost from Plan Amendments 0    
Amortization of prior service cost 0 0 0
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax 8    
Loss (Gain) recognized in other comprehensive income 9    
Deferred income taxes 0    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax 9    
Foreign Pension Plans, Defined Benefit [Member]      
Actuarial losses 77    
Prior Service Cost from Plan Amendments (2)    
Amortization of prior service cost 0 (1) (1)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax 3    
Loss (Gain) recognized in other comprehensive income 72    
Deferred income taxes (2)    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax 70    
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]      
Actuarial losses (3)    
Prior Service Cost from Plan Amendments 0    
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax (2)    
Loss (Gain) recognized in other comprehensive income (1)    
Deferred income taxes 0    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax (1)    
Foreign Postretirement Benefit Plans, Defined Benefit [Member]      
Actuarial losses 1    
Prior Service Cost from Plan Amendments (2)    
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax 0    
Loss (Gain) recognized in other comprehensive income (1)    
Deferred income taxes 0    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax $ (1)