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FAIR VALUE MEASUREMENTS - Fair Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Carrying amount    
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 846 $ 1,039
Financial liabilities 5,574 5,537
At fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 846 1,039
Financial liabilities 7,461 7,670
Borrowings1 [Member] | Carrying amount    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 5,152 5,155
Borrowings1 [Member] | At fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 7,039 7,288
Other liabilities | Carrying amount    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 422 382
Other liabilities | At fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities 422 382
Other assets | Carrying amount    
Disclosure of fair value measurement of assets [line items]    
Financial assets 419 571
Other assets | At fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 419 571
Other investments [Member] | Carrying amount    
Disclosure of fair value measurement of assets [line items]    
Financial assets 377 428
Other investments [Member] | At fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets 377 428
Derivatives | Carrying amount    
Disclosure of fair value measurement of assets [line items]    
Financial assets 50 40
Derivatives | At fair value [member]    
Disclosure of fair value measurement of assets [line items]    
Financial assets $ 50 $ 40