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Debt and Reedemable Preferred Securities of Subsidiaries (Tables)
12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Long-term debt
Long-term debt is composed of the following:
 
Weighted-
Average
Interest
Rate
 
Maturities
 
December 31
 
2017
 
2016
Notes and debentures
3.7%
 
2018 - 2047
 
$
6,577

 
$
7,101

Industrial development revenue bonds
1.6%
 
2018 - 2045
 
264

 
264

Bank loans and other financings in various currencies
7.3%
 
2018 - 2028
 
37

 
37

Total long-term debt
 
 
 
 
6,878

 
7,402

Less current portion
 
 
 
 
406

 
963

Long-term portion
 
 
 
 
$
6,472

 
$
6,439