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Financing Arrangements - Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Long-term debt maturities    
Long-term debt maturing in 2026 $ 500  
Long-term debt maturing in 2030 600  
Long-term debt maturing in 2037 250  
Long-term debt maturing in 2050 400  
Guaranteed obligations of consolidated subsidiaries $ 58 $ 57