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Debt and Redeemable Preferred Securities of Subsidiaries (Long-Term Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument    
Long-term Debt, Including Current Maturities $ 6,878 $ 7,402
Long-term Debt, Current 406 963
Long-Term Debt $ 6,472 6,439
Notes and Debentures    
Debt Instrument    
Weighted- Average Interest Rate 3.70%  
Maturities (start) Jan. 01, 2018  
Maturities (end) Dec. 31, 2047  
Long-term Debt, Including Current Maturities $ 6,577 7,101
Industrial Development Revenue Bonds    
Debt Instrument    
Weighted- Average Interest Rate 1.60%  
Maturities (start) Jan. 01, 2018  
Maturities (end) Dec. 31, 2045  
Long-term Debt, Including Current Maturities $ 264 264
Bank Loans And Other Financings In Various Currencies    
Debt Instrument    
Weighted- Average Interest Rate 7.30%  
Maturities (start) Jan. 01, 2018  
Maturities (end) Dec. 31, 2028  
Long-term Debt, Including Current Maturities $ 37 $ 37