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Debt and Borrowing Arrangements - Interest and Other Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Debt Disclosure [Abstract]    
Interest expense, debt $ 123 $ 102
Loss/(gain) related to interest rate swaps 0 (14)
Other (income)/expense, net (43) (8)
Interest and other expense, net 80 80
Net investment hedge debt | Net investment hedge derivative contracts    
Debt Instrument [Line Items]    
Gains (losses) included in other income related to hedge ineffectiveness $ 33 $ 17