Annual report pursuant to Section 13 and 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value, Assets and Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance - January 1 $ 45 $ 89
Included in earnings 122 79
Settlements (27) (123)
Settlement of pre-existing relationship (140) 0
Ending balance - December 31 0 45
Total gains for the period included in earnings attributable to the change in unrealized gains on assets still held at the reporting date $ 0 $ 45