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Compensation Plans (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2011
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock based compensation cost   $ 128 $ 136 $ 117
Income tax benefits related to stock-based compensation arrangements   $ 42 $ 45 $ 39
Equity and Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares each share counts against maximum once base threshold is exceeded 4.5      
Equity and Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Maximum Number Of Shares Reserved For Grant Or Settlement Of Awards 110,000,000      
Shares in excess must be counted against maximum number of shares granted 30,000,000      
Shares authorized for future grants   40,000,000    
Performance Chemicals [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost   $ 3