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Restructuring and Related Implementation Charges - Narrative (Details) - Global Growth and Efficiency Program
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
position
Sep. 30, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]        
Expected percent of total charges resulting in cash expenditure 80.00%   80.00%  
Charges against assets $ (6)   $ (16)  
Total Global Growth and Efficiency Program charges, pretax $ 26 $ 58 $ 115 $ 246
Pet Nutrition        
Restructuring Cost and Reserve [Line Items]        
Expected percent of total restructuring charges related to segment for the duration of the program 10.00%   10.00%  
Corporate        
Restructuring Cost and Reserve [Line Items]        
Expected percent of total restructuring charges related to segment for the duration of the program 40.00%   40.00%  
North America        
Restructuring Cost and Reserve [Line Items]        
Expected percent of total restructuring charges related to segment for the duration of the program 15.00%   15.00%  
Latin America        
Restructuring Cost and Reserve [Line Items]        
Expected percent of total restructuring charges related to segment for the duration of the program 5.00%   5.00%  
Europe        
Restructuring Cost and Reserve [Line Items]        
Expected percent of total restructuring charges related to segment for the duration of the program 20.00%   20.00%  
Asia Pacific        
Restructuring Cost and Reserve [Line Items]        
Expected percent of total restructuring charges related to segment for the duration of the program 5.00%   5.00%  
Africa/Eurasia        
Restructuring Cost and Reserve [Line Items]        
Expected percent of total restructuring charges related to segment for the duration of the program 5.00%   5.00%  
Employee-Related Costs        
Restructuring Cost and Reserve [Line Items]        
Estimated percent of total cumulative pretax charges of implementing restructuring program by category 50.00%   50.00%  
Charges against assets $ (1)   $ (8)  
Total Global Growth and Efficiency Program charges, pretax $ 9   $ 44  
Incremental Depreciation And Asset Impairment        
Restructuring Cost and Reserve [Line Items]        
Estimated percent of total cumulative pretax charges of implementing restructuring program by category 5.00%   5.00%  
Charges Resulting Directly From Exit Activities        
Restructuring Cost and Reserve [Line Items]        
Estimated percent of total cumulative pretax charges of implementing restructuring program by category 25.00%   25.00%  
Implementation Of New Strategies        
Restructuring Cost and Reserve [Line Items]        
Estimated percent of total cumulative pretax charges of implementing restructuring program by category 20.00%   20.00%  
Third party Incremental Cost        
Restructuring Cost and Reserve [Line Items]        
Total Global Growth and Efficiency Program charges, pretax $ 11   $ 31  
Contract Termination        
Restructuring Cost and Reserve [Line Items]        
Total Global Growth and Efficiency Program charges, pretax 1   32  
Minimum | Expected Completion Date 2019        
Restructuring Cost and Reserve [Line Items]        
Restructuring program expected cost before tax 1,730   1,730  
Restructuring program expected cost after tax 1,280   1,280  
Restructuring program expected cost, current fiscal year, before tax 125   125  
Restructuring program expected cost, current fiscal year, after tax 95   $ 95  
Restructuring and related cost, expected number of positions eliminated (in positions) | position     3,800  
Maximum | Expected Completion Date 2019        
Restructuring Cost and Reserve [Line Items]        
Restructuring program expected cost before tax 1,885   $ 1,885  
Restructuring program expected cost after tax 1,380   1,380  
Restructuring program expected cost, current fiscal year, before tax 165   165  
Restructuring program expected cost, current fiscal year, after tax $ 125   $ 125  
Restructuring and related cost, expected number of positions eliminated (in positions) | position     4,400