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FINANCIAL RISK MANAGEMENT FINANCIAL RISK MANAGEMENT - Liquidity (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Financial Instruments [Abstract]    
Corporate cash and financial assets $ 464 $ 273
Availability under committed credit facilities(2) 3,475 2,475
Draws on credit facility (1,131) (820)
Deposit from parent (545) 0
Commitments under credit facility (63) (54)
Corporate liquidity $ 2,200 $ 1,874