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Debt and Redeemable Preferred Securities of Subsidiaries (Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument    
Total Long-term debt $ 6,960 $ 6,878
Less current portion 713 406
Long-term portion $ 6,247 6,472
Notes and debentures    
Debt Instrument    
Weighted- Average Interest Rate 3.30%  
Maturities (start) Jan. 01, 2019  
Maturities (end) Dec. 31, 2047  
Total Long-term debt $ 6,756 6,577
Industrial development revenue bonds    
Debt Instrument    
Weighted- Average Interest Rate 1.90%  
Maturities (start) Jan. 01, 2023  
Maturities (end) Dec. 31, 2045  
Total Long-term debt $ 169 264
Bank loans and other financings In various currencies    
Debt Instrument    
Weighted- Average Interest Rate 7.00%  
Maturities (start) Jan. 01, 2019  
Maturities (end) Dec. 31, 2025  
Total Long-term debt $ 35 $ 37