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Debt and Other Financing Arrangements - Short-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Maturities classified as current $ 4 $ 11
Short-term borrowings 179 128
Bank overdrafts 2 14
Total short-term debt $ 185 $ 153