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Debt and Borrowing Arrangements - Interest and Other Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Debt Disclosure [Abstract]        
Interest expense, debt $ 115 $ 103 $ 217 $ 206
Loss on debt extinguishment 140 11 140 11
Loss/(gain) related to interest rate swaps 5 0 (9) 0
Other (income)/expense, net (12) 10 (20) 26
Interest and other expense, net $ 248 $ 124 $ 328 $ 243