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DEBT AND OTHER OBLIGATIONS (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Collateral Pledged for Repurchase Agreements
The following table provides the fair value of collateral pledged for repurchase agreements, grouped by asset class as of June 30, 2021 and December 31, 2020:

Repurchase Agreements, Securities Lending Transactions, and Repurchase-to-Maturity Transactions
Accounted for as Secured Borrowings
 Remaining Contractual Maturity of the Agreements
 As of June 30, 2021
 (Dollars In Millions)
Overnight and
Continuous		Up to 30 days30-90 daysGreater Than
90 days		Total
Repurchase agreements and repurchase-to-maturity transactions     
U.S. Treasury and agency securities$1,029 $38 $— $— $1,067 
Total repurchase agreements and repurchase-to-maturity transactions1,029 38 — — 1,067 
Securities lending transactions
Corporate securities151 — — — 151 
Equity securities1 — — — 1 
Redeemable preferred stocks1 — — — 1 
Total securities lending transactions153 — — — 153 
Total securities$1,182 $38 $— $— $1,220 

Repurchase Agreements, Securities Lending Transactions, and Repurchase-to-Maturity Transactions
Accounted for as Secured Borrowings
 Remaining Contractual Maturity of the Agreements
 As of December 31, 2020
 (Dollars In Millions)
Overnight and
Continuous		Up to 30 days30-90 daysGreater Than
90 days		Total
Repurchase agreements and repurchase-to-maturity transactions     
U.S. Treasury and agency securities$366 $86 $— $— $452 
Total repurchase agreements and repurchase-to-maturity transactions366 86 — — 452 
Securities lending transactions
Fixed maturity securities49 — — — 49 
Equity securities7 — — — 7 
Redeemable preferred stocks1 — — — 1 
Total securities lending transactions57 — — — 57 
Total securities$423 $86 $— $— $509