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Financing Arrangements - Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Long-term debt maturities    
Long-term debt $ 1,931 $ 1,744
Guaranteed obligations of consolidated subsidiaries 57 $ 56
Long-term debt maturing in 2020    
Long-term debt maturities    
Long-term debt 600  
Long-term debt maturing in 2026    
Long-term debt maturities    
Long-term debt 500  
Long-term debt maturing in 2037    
Long-term debt maturities    
Long-term debt 250  
Long-term debt maturing in 2019    
Long-term debt maturities    
Long-term debt $ 165