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FAIR VALUE MEASUREMENTS - NONRECURRING INPUTS (Details) - Rockies Express [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Mar. 29, 2016
Fair Value Inputs Assets Quantitative Information [Line Items]      
Equity Method Investment Ownership Percentage     25.00%
Proceeds From Sale Of Equity Method Investments $ 440 $ 443  
Equity Method Investment, Other than Temporary Impairment 44    
Equity Method Investment Other Than Temporary Impairment Net Of Tax Benefit $ 27    
Investments In Affiliates Subsidiaries Associates And Joint Ventures Fair Value Disclosure     $ 440
Market Approach Valuation Technique [Member] | Fair Value, Inputs, Level 2 [Member] | One Hundred Percent [Member]      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Investments In Affiliates Subsidiaries Associates And Joint Ventures Fair Value Disclosure     $ 440