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Borrowings and Other Obligations (Schedule of Short-term Debt) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Short-term Debt [Line Items]    
Finance Lease Current Portion $ 11 $ 10
Short-term Borrowings 26 13
Long-term Debt 2,149 2,151
Other short-term bank loans    
Short-term Debt [Line Items]    
Finance Lease Current Portion 11 10
Other Short-term Loans $ 15 $ 3