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VARIABLE INTEREST ENTITIES - Consolidated VIEs (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
[1]
Dec. 31, 2016
[1]
ASSETS (LIABILITIES)        
Cash and cash equivalents $ 68 $ 33 $ 77 $ 64
Accounts receivable and other 36 42    
Contract assets 7      
Inventories 7 8    
Other current assets 11 7    
Equity investments 1,217 1,213    
Plant, property and equipment, net 2,105 2,123    
Other assets 9 3    
Accounts payable and accrued liabilities (35) (31)    
Accounts payable to affiliates, net (6) (5)    
Distributions payable (2) (1)    
Accrued interest (21) (12)    
Current portion of long-term debt (45) (51)    
Long-term debt (2,332) (2,352)    
Other liabilities (29) (29)    
Consolidated VIEs | Restricted VIEs        
ASSETS (LIABILITIES)        
Cash and cash equivalents 31 19    
Accounts receivable and other 23 30    
Contract assets 7      
Inventories 6 6    
Other current assets 6 5    
Equity investments 1,217 1,213    
Plant, property and equipment, net 1,126 1,133    
Other assets 1 1    
Accounts payable and accrued liabilities (26) (24)    
Accounts payable to affiliates, net (29) (42)    
Distributions payable (2) (1)    
State taxes payable (1)      
Accrued interest (5) (2)    
Current portion of long-term debt (45) (51)    
Long-term debt (308) (308)    
Other liabilities (27) (26)    
Deferred state income tax $ (10) $ (10)    
[1] Recast to consolidate PNGTS (Refer to Note 2).