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INVESTMENTS - Repurchase Agreements and Securities Lending (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
U.S. corporate public securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities $ 301 $ 311
Equity securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities 164 106
Overnight & Continuous | U.S. corporate public securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities 0 0
Overnight & Continuous | Equity securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities 164 106
Up to 30 days | U.S. corporate public securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities 200 111
Up to 30 days | Equity securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities 0 0
30-90 days | U.S. corporate public securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities 101 200
30-90 days | Equity securities    
Assets Sold under Agreements to Repurchase [Line Items]    
Securities $ 0 $ 0