ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
ACCOUNTS RECEIVABLE AND OTHER
Trade accounts receivable, net of allowance of nil	$ 34	$ 32
Imbalance receivable from affiliates	2	1
Other	1
Accounts receivable and other	37	33
Trade accounts receivable, allowance	$ 0	$ 0