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FAIR VALUE OF FINANCIAL INVESTMENTS - Fair Value of Debt (Details) - USD ($)
$ in Billions
Dec. 31, 2020
Dec. 31, 2019
Fair Value    
Fair value of debt    
Long-term and short-term debt $ 3.3 $ 3.0
Carrying Value    
Fair value of debt    
Debt, long-term and short-term $ 2.8 $ 2.8