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Short-term Borrowings and Other Debt Obligations (Schedule of Short-term Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Short-term Debt [Line Items]    
Short-term Borrowings and Current Portion of Long-term Debt $ 930 $ 383
364 Day Secured RCF [Member]    
Short-term Debt [Line Items]    
Short-term debt 317 317
A&R Credit Agreement    
Short-term Debt [Line Items]    
Short-term debt 305 0
Other short-term bank loans    
Short-term Debt [Line Items]    
Short-term debt 0 9
Current Portion of Long-term Debt (includes Term Loan Agreement) $ 308 $ 57