Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Gross Unrecognized Tax Benefits (Details)

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INCOME TAXES - Gross Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Unrecognized tax benefits at beginning of period $ 0 $ 0
Gross increases for tax positions taken during prior years 46 0
Unrecognized tax benefits at end of period $ 46 $ 0