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Investments in Affiliates - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Equity Method Investee [Member]      
Investments in Affiliates      
Net sales $ 98 $ 135 $ 143
Purchases $ 133 $ 249 $ 125
Consolidated Subsidiaries [Member] | Minimum [Member]      
Investments in Affiliates      
Voting stock ownership percentage 20.00%    
Consolidated Subsidiaries [Member] | Maximum [Member]      
Investments in Affiliates      
Voting stock ownership percentage 50.00%