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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Carrying amount    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets $ 1,039 $ 871
Financial liabilities 5,537 5,745
Carrying amount | Debt    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 5,155 5,536
Carrying amount | Other liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 382 209
Carrying amount | Other assets    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 571 612
Carrying amount | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 428 258
Carrying amount | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 40 1
Estimated fair value    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 1,039 871
Financial liabilities 7,670 7,063
Estimated fair value | Debt    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 7,288 6,854
Estimated fair value | Other liabilities    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial liabilities 382 209
Estimated fair value | Other assets    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 571 612
Estimated fair value | Other investments    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets 428 258
Estimated fair value | Derivatives    
Disclosure Of Fair Value Measurement Of Assets And Liabilities1 [Line Items]    
Financial assets $ 40 $ 1