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ACCOUNTS PAYABLE AND OTHER (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current:    
Accounts payable $ 246 $ 266
Accrued & other liabilities 400 274
Deferred revenue 159 108
Provisions 59 64
Total current 864 712
Non-current:    
Deferred revenue 300 293
Pension liabilities 100 98
Provisions 95 41
Other liabilities 298 148
Total non-current $ 793 $ 580
Average credit period on purchases of goods and services 30 days