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Debt and Redeemable Preferred Securities of Subsidiaries (Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument    
Total long-term debt $ 7,402 $ 6,704
Less current portion 963 598
Long-term portion $ 6,439 6,106
Notes and Debentures    
Debt Instrument    
Weighted- Average Interest Rate 4.30%  
Maturities (start) Jan. 01, 2016  
Maturities (end) Dec. 31, 2045  
Total long-term debt $ 7,101 6,396
Industrial Development Revenue Bonds    
Debt Instrument    
Weighted- Average Interest Rate 0.20%  
Maturities (start) Jan. 01, 2018  
Maturities (end) Dec. 31, 2034  
Total long-term debt $ 264 264
Bank Loans And Other Financings In Various Currencies    
Debt Instrument    
Weighted- Average Interest Rate 5.40%  
Maturities (start) Jan. 01, 2016  
Maturities (end) Dec. 31, 2025  
Total long-term debt $ 37 $ 44