v2.4.0.6
Postretirement Healthcare Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
U.S. and Foreign Postretirement Healthcare Benefits
     
Amounts recognized in the balance sheet consist of:      
Prior service cost (credit) included in accumulated other comprehensive income that is expected to be recognized in net periodic benefit costs in 2011 $ 1    
Prior service cost (credit) included in accumulated other comprehensive income that is expected to be recognized in net periodic benefit costs in 2011, net of tax 1    
Net acturial loss included in accumulated other comprehensive income that is expected to be recognized in net periodic benefit costs in 2011 1    
Net actuarial loss included in accumulated other comprehensive income that is expected to be recognized in net periodic benefit costs in 2011, net of tax 1    
U.S. Postretirement Healthcare Benefits
     
Change in benefit obligations:      
Benefit obligation as of beginning of year 26 25  
Interest cost 2 2  
Actuarial (gain) loss, net (6) 1  
Employee contributions 1 1  
Benefits paid (3) (3)  
Benefit obligation as of end of year 20 26 25
Change in plan assets:      
Employer contributions 2 2  
Employee contributions 1 1  
Benefits paid (3) (3)  
Funded status and net amounts recognized:      
Plan assets less than benefit obligation (20) (26)  
Net liability recognized in the balance sheet (20) (26)  
Amounts recognized in the balance sheet consist of:      
Current liabilities (2) (3)  
Non-current liabilities (18) (23)  
Net (liability) asset recognized (20) (26)  
Unrecognized prior service cost 1    
Unrecognized prior service cost, net of tax 1    
Unrecognized actuarial gain (loss) 1    
Unrecognized actuarial gain (loss), net of tax 1    
Net periodic benefit cost:      
Interest cost 2 2 1
Net periodic benefit cost 2 2 1
Weighted-average assumptions to determine benefit obligations      
Discount rate (as a percent) 5.30% 5.80%  
Weighted-average assumptions to determine the Net periodic benefit cost      
Discount rate (as a percent) 5.80% 6.50% 6.40%
Annual rate of increase in the per capita cost of covered health care benefits assumed (as a percent) 11.18% 12.00%  
Annual rate of decrease in the per capita cost of covered health care through 2029 and thereafter (as a percent) 4.50%    
One-percentage-point change in assumed health care cost trend rates      
Effect of a one-percentage-point increase to total of service and interest cost components 0    
Effect of a one-percentage-point decrease to total of service and interest cost components 0    
Effect of a one-percentage-point increase to postretirement benefit obligation 1    
Effect of a one-percentage-point decrease to postretirement benefit obligation (1)    
Estimated contribution by employer, next fiscal year 2    
Defined benefit pension plans estimated future benefit payments      
2011 2    
2012 2    
2013 2    
2014 2    
2015 2    
2016-2020 7    
Foreign Postretirement Healthcare Benefits
     
Change in benefit obligations:      
Benefit obligation as of beginning of year 111 72  
Service cost 1 2  
Interest cost 10 10  
Actuarial (gain) loss, net 12 11  
Net transfers in (out)   4  
Plan amendments   (8)  
Plan settlements (32)    
Effect of acquisitions 1    
Benefits paid (8) (6)  
Impact of foreign exchange rates 5 26  
Benefit obligation as of end of year 100 111 72
Change in plan assets:      
Employer contributions 8 6  
Benefits paid (8) (6)  
Funded status and net amounts recognized:      
Plan assets less than benefit obligation (100) (111)  
Net liability recognized in the balance sheet (100) (111)  
Amounts recognized in the balance sheet consist of:      
Current liabilities (8) (7)  
Non-current liabilities (92) (104)  
Net (liability) asset recognized (100) (111)  
Unrecognized prior service cost 6    
Unrecognized prior service cost, net of tax 4    
Unrecognized actuarial gain (loss) (13)    
Unrecognized actuarial gain (loss), net of tax (8)    
Net periodic benefit cost:      
Service cost 1 2 1
Interest cost 10 10 6
Amortization of prior service cost (1)    
Amortization of net loss (gain) 2   1
Settlement gain recognized (26)    
Net periodic benefit cost (14) 12 8
Weighted-average assumptions to determine benefit obligations      
Discount rate (as a percent) 10.80% 11.30%  
Weighted-average assumptions to determine the Net periodic benefit cost      
Discount rate (as a percent) 11.30% 12.40% 9.30%
Annual rate of increase in the per capita cost of covered health care benefits assumed (as a percent) 8.07% 8.95%  
One-percentage-point change in assumed health care cost trend rates      
Effect of a one-percentage-point increase to total of service and interest cost components 1    
Effect of a one-percentage-point decrease to total of service and interest cost components (1)    
Effect of a one-percentage-point increase to postretirement benefit obligation 12    
Effect of a one-percentage-point decrease to postretirement benefit obligation (10)    
Estimated contribution by employer, next fiscal year 8    
Defined benefit pension plans estimated future benefit payments      
2011 8    
2012 8    
2013 8    
2014 9    
2015 9    
2016-2020 51    
Foreign Postretirement Healthcare Benefits | Fertilizers
     
Change in benefit obligations:      
Plan settlements $ (32)