TRANSACTIONS WITH MAJOR CUSTOMERS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Transactions with major customers
Revenues	$ 88	$ 85	$ 82	$ 86	$ 87	$ 84	$ 84	$ 88	$ 341	[1]	$ 343	[1]	$ 353	[1]
Total revenues | Customer concentration risk | Anadarko Energy Services Company
Transactions with major customers
Revenues									48		48		45
Total revenues | Customer concentration risk | Pacific Gas and Electric Company
Transactions with major customers
Revenues									$ 46		$ 47		$ 68

[1] (a) Recast as discussed in Note 2 and Note 6.