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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.