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FINANCIAL RISK MANAGEMENT - Liquidity (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Financial Instruments [Abstract]    
Corporate cash and financial assets $ 683 $ 464
Availability under committed credit facilities 3,475 3,475
Commercial paper (431) 0
Draws on credit facility 0 (1,131)
Deposit from parent 0 (545)
Commitments under credit facility (12) (63)
Corporate liquidity $ 3,715 $ 2,200