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Financing arrangements (Interest Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]      
Interest expense, net $ 1,304 $ 1,260 $ 1,095
Interest paid, net of interest rate and cross currency swaps $ 1,300 $ 1,200 $ 1,000