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FAIR VALUE DISCLOSURES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Fair value adjustments on GMIB asset $ 166   $ 148
Fair value adjustments on amounts due from reinsurers 215   210
AFS fixed maturities transferred from Level 3 to Level 2 8 $ 549  
AFS fixed maturities transferred from Level 2 to Level 3 $ 70 $ 2  
AFS fixed maturities transferred between Level 2 and 3 (percentage) 1.40% 8.00%  
Level 3 | Nonrecurring      
Fair Value Inputs Assets Quantitative Information 1 [Line Items]      
Fair value measurements not included in quantitative information about level 3 fair value measurements $ 1,100   $ 430