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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Supplemental Cash Flow Information    
Interest paid in cash $ 128 $ 145
Income taxes paid in cash 75 89
Interest paid for note repurchase premiums related to debt repaid prior to maturity   16
Amount of receivables sold 221 205
U.S.    
Supplemental Cash Flow Information    
Income taxes paid in cash 7 6
Non-U.S.    
Supplemental Cash Flow Information    
Income taxes paid in cash $ 68 $ 83