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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Level 1 of fair value hierarchy [member] | Estimated fair value | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Total liabilities $ 0  
Total liabilities 14,016 $ 14,241
Carrying amount    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 628 608
Financial liabilities 6,917 6,707
Carrying amount | Debt    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 6,392 6,423
Carrying amount | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 6 32
Carrying amount | Other liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 519 252
Carrying amount | Other assets    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 559 572
Carrying amount | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 63 33
Carrying amount | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 6 3
Estimated fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 628 608
Financial liabilities 7,585 7,999
Estimated fair value | Debt    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 7,060 7,715
Estimated fair value | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Total liabilities 0  
Financial liabilities 6 32
Estimated fair value | Other liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 519 252
Estimated fair value | Other assets    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 559 572
Estimated fair value | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 63 33
Estimated fair value | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets $ 6 $ 3