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FAIR VALUE DISCLOSURES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Fair Value Inputs Assets Quantitative Information [Line Items]      
Change in purchased market risk benefit asset fair value $ 114   $ 382
AFS fixed maturities transferred from Level 3 to Level 2 879 $ 169  
AFS fixed maturities transferred from Level 2 to Level 3 $ 183 $ 120  
Percentage of total equity representing AFS fixed maturities transferred 25.30% 7.80%  
Nonrecurring | Level 3      
Fair Value Inputs Assets Quantitative Information [Line Items]      
Investments, fair value $ 1,800   $ 1,700