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FAIR VALUE MEASUREMENTS - NONRECURRING FAIR VALUE MEASURES (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2016
May 31, 2016
Mar. 31, 2016
Jun. 30, 2017
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
[1]
Sep. 29, 2016
May 09, 2016
Mar. 29, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Remeasurement of equity method investment             $ 0 $ 617 [1] $ 0      
Equity method investment             2,517 $ 2,080        
Market Approach Valuation Technique [Member] | IEnova Pipelines [Member] | Level 2 [Member]                        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Fair value of investment $ 1,144                      
% of fair value measurement 100.00%                      
Range of inputs 100.00%                      
Market Approach Valuation Technique [Member] | TdM [Member] | Level 2 [Member]                        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Fair value of investment       $ 62     $ 78     $ 145    
% of fair value measurement       100.00%           100.00%    
Range of inputs       100.00%           100.00%    
Market Approach Valuation Technique [Member] | Rockies Express [Member] | Level 2 [Member]                        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Fair value of investment                       $ 440
% of fair value measurement                       100.00%
Range of inputs                       100.00%
Sempra Mexico [Member] | IEnova Pipelines [Member]                        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Acquired percentage interest 50.00%                      
Ownership percentage in equity method investee 100.00%                      
Remeasurement of equity method investment $ 617                      
Gain on acquisition of remaining voting rights, net of tax 432                      
Fair value of investment 1,144                      
Equity method investment 520                      
Reclassification adjustment from AOCI (7)                      
Fair value of business combination $ 2,288                      
Sempra Mexico [Member] | TdM [Member]                        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Other than temporary impairment in investment       $ 71 $ 131              
Other than temporary impairment in investment, net of tax         $ 111              
Sempra LNG & Midstream [Member]                        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Other than temporary impairment in investment     $ 44                  
Other than temporary impairment in investment, net of tax     $ 27                  
Sempra LNG & Midstream [Member] | Rockies Express [Member]                        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                        
Ownership percentage in equity method investee   25.00% 25.00%               25.00% 25.00%
Fair value of investment     $ 440                  
Equity method investment     484                  
Other than temporary impairment in investment     44     $ 44            
Other than temporary impairment in investment, net of tax     27     $ 27            
Proceeds from sale of investments   $ 443 $ 440                  
[1] As adjusted for the retrospective adoption of ASU 2016-15 and ASU 2016-18, which we discuss in Note 2.