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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Great Lakes
Mar. 31, 2013
Great Lakes
Jun. 30, 2012
Great Lakes
Jun. 30, 2013
Great Lakes
Jun. 30, 2012
Great Lakes
Dec. 31, 2012
Great Lakes
Jan. 02, 2013
Northern Border
Jun. 30, 2013
Northern Border
Jun. 30, 2012
Northern Border
Jun. 30, 2013
Northern Border
Jun. 30, 2012
Northern Border
Dec. 31, 2012
Northern Border
Apr. 30, 2006
Northern Border
Jun. 30, 2013
GTN
Jun. 30, 2012
GTN
Jun. 30, 2013
GTN
Jun. 30, 2012
GTN
Dec. 31, 2012
GTN
Jun. 30, 2013
Bison
Jun. 30, 2012
Bison
Jun. 30, 2013
Bison
Jun. 30, 2012
Bison
Dec. 31, 2012
Bison
Investments in unconsolidated affiliates                                                        
Ownership interest at the end of the period (as a percent)           46.45%     46.45%       50.00%   50.00%       25.00%   25.00%     25.00%   25.00%    
Equity Earnings from Unconsolidated Affiliates $ 22 $ 31 $ 48 $ 69       $ 8 $ 2 $ 17     $ 15 $ 16 $ 31 $ 36     $ 4 $ 4 $ 9 $ 10   $ 3 $ 3 $ 6 $ 6  
Undistributed earnings                 0 0         0 0         0 0       0 0  
Investments in Unconsolidated Affiliates 1,545   1,545   1,563 671     671   677   500   500   512   212   212   216 162   162   158
Amortization period of transaction fee                             12 years                          
Transaction fee                             10                          
Additional ownership interest acquired (as a percent)                                   20.00%                    
Equity contribution             4   4 4                           6   6    
Total cash call issued to fund debt repayment             9                                 24        
Assets                                                        
Current assets           41     41   56               51   51   50 16   16   7
Cash and cash equivalents                         31   31   28                      
Other current assets                         33   33   35                      
Plant, property and equipment, net           784     784   799   1,212   1,212   1,234   1,152   1,152   1,174 640   640   649
Other assets                         30   30   31   1   1   1          
Assets, total           825     825   855   1,306   1,306   1,328   1,204   1,204   1,225 656   656   656
LIABILITIES AND PARTNERS' EQUITY                                                        
Current liabilities           22     22   30   52   52   53   13   13   16 7   7   25
Deferred credits and other                         18   18   16   21   21   20          
Long-term debt, including current maturities           345     345   354   473   473   473   325   325   325          
Partners' equity                                                        
Partners' equity           458     458   471   765   765   789   845   845   864 649   649   631
Accumulated other comprehensive loss                         (2)   (2)   (3)                      
Liabilities and Equity, total           825     825   855   1,306   1,306   1,328   1,204   1,204   1,225 656   656   656
Revenues (expenses)                                                        
Transmission revenues           29   48 64 97     69 73 141 154     46 48 95 100   20 20 40 40  
Operating expenses           (15)   (16) (30) (31)     (19) (18) (38) (36)     (12) (13) (23) (24)   (4) (4) (8) (7)  
Depreciation           (8)   (8) (16) (16)     (14) (16) (29) (32)     (14) (14) (27) (27)   (5) (5) (10) (10)  
Financial charges and other           (7)   (7) (14) (14)     (6) (7) (11) (13)     (5) (4) (9) (9)            
Net income/(loss)           $ (1)   $ 17 $ 4 $ 36     $ 30 $ 32 $ 63 $ 73     $ 15 $ 17 $ 36 $ 40   $ 11 $ 11 $ 22 $ 23  
Reduction in current transportation rates (as a percent)                       11.00%