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FAIR VALUE MEASUREMENTS - NONRECURRING INPUTS (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 29, 2016
Dec. 31, 2015
Fair Value Inputs Assets Quantitative Information [Line Items]      
Equity Method Investments $ 2,727   $ 2,905
Rockies Express [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Equity Method Investment Ownership Percentage   25.00%  
Proceeds From Sale Of Equity Method Investments 440    
Equity Method Investment, Other than Temporary Impairment 44    
Equity Method Investment Other Than Temporary Impairment Net Of Tax Benefit 27    
Equity Method Investments $ 436 $ 484  
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 2 [Member] | One Hundred Percent [Member] | Rockies Express [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Investments In Affiliates Subsidiaries Associates And Joint Ventures Fair Value Disclosure [1]   $ 440  
[1] At measurement date of March 29, 2016. At March 31, 2016, our investment in Rockies Express had a carrying value of $436 million, reflecting subsequent equity method activity to record a distribution.