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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
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 14,135 $ 13,246
Carrying amount    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 747 771
Financial liabilities 6,326 6,038
Carrying amount | Debt    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 5,807 5,738
Carrying amount | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 0 3
Carrying amount | Other liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 519 297
Carrying amount | Other assets    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 524 559
Carrying amount | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 221 209
Carrying amount | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 2 3
Estimated fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 747 771
Financial liabilities 7,444 6,483
Estimated fair value | Debt    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 6,925 6,183
Estimated fair value | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Total liabilities (2)  
Financial liabilities 0 3
Estimated fair value | Other liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 519 297
Estimated fair value | Other assets    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 524 559
Estimated fair value | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 221 209
Estimated fair value | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets $ 2 $ 3