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Supplementary Information - Consolidated Statements of Cash Flow (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplementary Cash Flow Information      
Share-based compensation expense $ 21 $ 26 $ 28
Other 18 13 16
Total other non-cash charges to net income 39 39 44
Interest paid 73 77 59
Income taxes paid $ 231 $ 289 $ 254