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Segment Information-DRC (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 31, 2017
Segment Information          
Total investment in affiliate $ 849   $ 849   $ 851
Loss from affiliates (16) $ (8) (22) $ (7)  
Commodity Trading and Milling          
Segment Information          
Total investment in affiliate 255   255   240
Loss from affiliates $ (4) $ 2 $ (6) $ 6  
Bakery business | Commodity Trading and Milling | Democratic Republic of Congo          
Segment Information          
Percentage of ownership interest accounted for as equity method investment 50.00%   50.00%    
Total investment in affiliate $ 0   $ 0    
Notes receivable from affiliates, net $ 11   $ 11   $ 15
Percentage of note receivable guaranteed by the other shareholder 50.00%   50.00%    
Loss from affiliates $ 2   $ 4