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FAIR VALUE MEASUREMENTS - NONRECURRING INPUTS (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 26, 2016
May 31, 2016
Mar. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 29, 2016
Sep. 27, 2016
Sep. 25, 2016
Mar. 29, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]                      
Pretax gain for the excess of acquisition date fair value over carrying value           $ 617 $ 0        
Impairment of equity method investment           131          
Impairment of equity method investment after-tax           111          
TdM [Member] | Carrying amount [Member]                      
Fair Value Inputs, Assets, Quantitative Information [Line Items]                      
Fair value of equity method investment       $ 146   146          
Market Approach Valuation Technique [Member] | Level 2 [Member] | TdM [Member]                      
Fair Value Inputs, Assets, Quantitative Information [Line Items]                      
Fair value of equity method investment               $ 145      
Fair Value Inputs, Percentage of Fair Value Measurement               100.00%      
Fair Value Inputs, Range of Inputs               100.00%      
Market Approach Valuation Technique [Member] | Level 2 [Member] | GdC [Member]                      
Fair Value Inputs, Assets, Quantitative Information [Line Items]                      
Fair value of equity method investment $ 1,144                    
Fair Value Inputs, Percentage of Fair Value Measurement 100.00%                    
Fair Value Inputs, Range of Inputs 100.00%                    
Market Approach Valuation Technique [Member] | Level 2 [Member] | Rockies Express [Member]                      
Fair Value Inputs, Assets, Quantitative Information [Line Items]                      
Fair value of equity method investment                     $ 440
Fair Value Inputs, Percentage of Fair Value Measurement                     100.00%
Fair Value Inputs, Range of Inputs                     100.00%
Sempra Mexico [Member] | TdM [Member]                      
Fair Value Inputs, Assets, Quantitative Information [Line Items]                      
Impairment of equity method investment       131              
Impairment of equity method investment after-tax       $ 111              
Sempra Mexico [Member] | GdC [Member]                      
Fair Value Inputs, Assets, Quantitative Information [Line Items]                      
Ownership percentage acquired 50.00%                    
Ownership percentage 100.00%               100.00% 50.00%  
Pretax gain for the excess of acquisition date fair value over carrying value $ 617                    
After-tax gain for the excess of acquisition date fair value over carrying value 432                    
Fair value of equity method investment 1,144                    
Carrying value of equity method investment 520                    
Losses reclassified from accumulated other comprehensive loss 7                    
Total fair value of business combination $ 2,288                    
Sempra Natural Gas [Member] | Rockies Express [Member]                      
Fair Value Inputs, Assets, Quantitative Information [Line Items]                      
Ownership percentage   25.00% 25.00%   25.00%           25.00%
Fair value of equity method investment     $ 440   $ 440            
Carrying value of equity method investment     484   484            
Impairment of equity method investment         44 44          
Impairment of equity method investment after-tax         $ 27 $ 27          
Proceeds from sale of equity method investment   $ 443 $ 440