ACCOUNTS RECEIVABLE AND OTHER (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
ACCOUNTS RECEIVABLE AND OTHER
Trade accounts receivable, net of allowance of nil	$ 40	$ 44
Imbalance receivable from affiliates	1	2
Other	1	1
Accounts receivable and other	$ 42	$ 47	[1]

[1] Recast to consolidate PNGTS (Refer to Notes 2 and 7).