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Derivative instruments Derivative instruments (Fair Value Hedging Relationships) (Details) - Interest expense, net [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]      
Net unrealized losses recognized on interest rate swap contracts $ (42) $ (85) $ (34)
Net unrealized gains recognized on related hedged debt $ 42 $ 85 $ 34