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Debt and Borrowing Arrangements - Interest and Other Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt Disclosure [Abstract]        
Interest expense, debt $ 117 $ 89 $ 334 $ 295
Loss on debt extinguishment 0 0 140 11
Loss/(gain) related to interest rate swaps (1) 0 (10) 0
Other (income)/expense, net (30) (70) (50) (44)
Interest and other expense, net $ 86 $ 19 $ 414 $ 262