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Fair Value Measurement - Quantitative Information - Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 8,118 $ 8,917
Level 3 | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 1,448 $ 1,425
Level 3 | Credit derivative liabilities, net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value inputs internal floor   0.10%
Minimum | Level 3 | Credit derivative liabilities, net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value inputs internal floor 0.10%  
Maximum | Level 3 | Credit derivative liabilities, net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value inputs internal floor 0.855%  
Weighted Average | Level 3 | Credit derivative liabilities, net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value inputs internal floor 2970.00%  
Obligations of state and political subdivisions | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 10 $ 6
Obligations of state and political subdivisions | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 5.50% 7.40%
Obligations of state and political subdivisions | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 22.00% 22.50%
Obligations of state and political subdivisions | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 7.50% 7.80%
RMBS | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 145 $ 154
RMBS | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 7.70% 7.50%
RMBS | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 10.80% 11.30%
RMBS | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 9.10% 8.90%
CLOs | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 611 $ 450
CLOs | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 12.50%  
CLOs | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 22.50%  
CLOs | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 17.90%  
Others | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 420 $ 353
Others | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.40% 6.20%
Others | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 9.10% 11.70%
Others | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.70% 7.80%
FG VIEs (see Note 8) | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 147 $ 174
FG VIEs (see Note 8) | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.80% 5.50%
FG VIEs (see Note 8) | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 10.80% 10.90%
FG VIEs (see Note 8) | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 9.30% 9.40%
Consolidated investment vehicles | Valuation, Income Approach | Level 3 | Assets of CIVs, equity securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 99 $ 80
Yield (as a percent)   20.90%
Consolidated investment vehicles | Valuation, Income Approach | Level 3 | Structured products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value   $ 189
Consolidated investment vehicles | Minimum | Valuation, Income Approach | Level 3 | Structured products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent)   1470.00%
Consolidated investment vehicles | Maximum | Valuation, Income Approach | Level 3 | Structured products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent)   2140.00%
Consolidated investment vehicles | Weighted Average | Valuation, Income Approach | Level 3 | Structured products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent)   1800.00%
Other assets | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 2 $ 13
Fair value inputs term 10 years 10 years
Other assets | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.50% 7.80%
Other assets | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 7.00% 8.40%
Other assets | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.80% 8.10%
Other invested assets | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 4 $ 3
Fixed Maturities, Trading Securities | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Asset, fair value $ 5  
Fixed Maturities, Trading Securities | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 19.80%  
Fixed Maturities, Trading Securities | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 169.50%  
Fixed Maturities, Trading Securities | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 163.80%  
Conditional prepayment rate (CPR) | RMBS | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 1.80% 0.10%
Conditional prepayment rate (CPR) | RMBS | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 17.00% 15.00%
Conditional prepayment rate (CPR) | RMBS | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 2.80% 3.40%
Conditional prepayment rate (CPR) | FG VIEs (see Note 8) | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 2.20% 0.20%
Conditional prepayment rate (CPR) | FG VIEs (see Note 8) | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 25.00% 21.40%
Conditional prepayment rate (CPR) | FG VIEs (see Note 8) | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 5.70% 7.80%
CDR | Minimum | Level 3 | Credit Default Swap | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 3.90% 3.30%
CDR | Maximum | Level 3 | Credit Default Swap | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 4.40% 4.80%
CDR | Weighted Average | Level 3 | Credit Default Swap | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 4.30% 3.60%
CDR | RMBS | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 1.80% 1.50%
CDR | RMBS | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 18.70% 18.80%
CDR | RMBS | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 5.40% 5.60%
CDR | FG VIEs (see Note 8) | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 1.30% 1.30%
CDR | FG VIEs (see Note 8) | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 41.00% 41.00%
CDR | FG VIEs (see Note 8) | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 10.70% 10.40%
Loss severity | RMBS | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 50.00% 50.00%
Loss severity | RMBS | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 125.00% 125.00%
Loss severity | RMBS | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 79.90% 82.60%
Loss severity | FG VIEs (see Note 8) | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 45.00% 45.00%
Loss severity | FG VIEs (see Note 8) | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 100.00% 100.00%
Loss severity | FG VIEs (see Note 8) | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate (as a percent) 83.20% 82.90%
Measurement Input, Discount Rate | CLOs | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 0.80% 1.10%
Measurement Input, Discount Rate | CLOs | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 2.90% 9.50%
Measurement Input, Discount Rate | CLOs | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 1.90% 2.60%
Measurement Input, Discount Rate | Consolidated investment vehicles | Valuation, Income Approach | Level 3 | Assets of CIVs, equity securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 24.30%  
Multiple enterprise/revenue value | Consolidated investment vehicles | Valuation, Market Approach | Level 3 | Assets of CIVs, equity securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Exit multiple-price to book 105.00%  
Exit multiple-price to earnings 550.00% 550.00%
Multiple enterprise/revenue value | Consolidated investment vehicles | Valuation, Market Approach | Level 3 | Equity Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Exit multiple-price to book   110.00%
Measurement Input, EBITDA Multiple | Minimum | Valuation, Market Approach | Level 3 | Assets of CIVs, equity securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market multiple - enterprise value/EBITDA   5.50
Measurement Input, Long-Term Revenue Growth Rate | Consolidated investment vehicles | Valuation, Income Approach | Level 3 | Equity Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent)   4.00%
Measurement Input, Long-Term Revenue Growth Rate | Consolidated investment vehicles | Valuation, Market Approach | Level 3 | Assets of CIVs, equity securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 4.00%  
Measurement Input, Price to Earnings | Consolidated investment vehicles | Valuation, Market Approach | Level 3 | Assets of CIVs, equity securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market multiple-price to earnings 5.25  
Measurement Input, Price to Book | Consolidated investment vehicles | Valuation, Market Approach | Level 3 | Equity Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent)   110.00%