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Debt - Interest Income/Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]      
Interest paid on short-term and long-term debt $ 100 $ 129 $ 5
Interest Expense 112 137 40
Interest Income $ 7 $ 3 $ 3