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Investments - Payables for Collateral on Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Carrying Value    
Collateral payable for derivative investments $ 5,558 $ 7,213
Securities pledged under securities lending agreements 167 157
Securities pledged under repurchase agreements 57 0
Investments pledged for FHLBI 2,500 2,650
Total payables for collateral on investments 8,282 10,020
Fair Value    
Collateral payable for derivative investments 5,558 7,213
Securities pledged under securities lending agreements 161 151
Securities pledged under repurchase agreements 59 0
Investments pledged for Federal Home Loan Bank of Indianapolis('FHLBI') 3,480 3,657
Total payables for collateral on investments $ 9,258 $ 11,021
Percentage of the fair value of domestic securities obtained as collateral under securities lending agreements. 102.00%  
Percentage of the fair value of foreign securities obtained as collateral under securities lending agreements. 105.00%  
Minimum    
Fair Value    
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements 80.00%  
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for AFS Securities 105.00%  
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for mortgage loan 155.00%  
Maximum    
Fair Value    
Percentage of the fair value of securities obtained as collateral under reverse repurchase agreements 95.00%  
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for AFS Securities 115.00%  
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for mortgage loan 175.00%