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Debt and Borrowing Arrangements - Short-Term Borrowings and Related Weighted-Average Interest Rates (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Short-term Debt [Line Items]    
Amount Outstanding $ 29 $ 2,638
Commercial paper    
Short-term Debt [Line Items]    
Amount Outstanding $ 0 $ 2,581
Weighted- Average Rate 0.00% 2.00%
Bank loans    
Short-term Debt [Line Items]    
Amount Outstanding $ 29 $ 57
Weighted- Average Rate 4.80% 5.20%