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Fair Value Measurement - Quantitative Information - Assets & Liabilities (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 8,186 $ 8,118
Fair value (190) (198)
Level 3 | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value 1,146 1,448
Fair value $ (190) (198)
Level 3 | Credit derivative liabilities, net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Internal floor (in bps) 0.00100  
Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ (159) (164)
Valuation, Income Approach | Level 3 | Credit derivative liabilities, net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value $ (26) $ (29)
Minimum | Level 3 | Credit derivative liabilities, net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Hedge cost (in bps) 0.118% 0.128%
Bank profit (as a percent) 0.55% 0.732%
Internal floor (in bps)   0.00100
Minimum | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 5.20% 5.50%
Maximum | Level 3 | Credit derivative liabilities, net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Hedge cost (in bps) 0.279% 0.301%
Bank profit (as a percent) 2.577% 2.759%
Internal floor (in bps)   0.00855
Maximum | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 9.90% 10.80%
Weighted Average | Level 3 | Credit derivative liabilities, net    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Hedge cost (in bps) 0.154% 0.168%
Bank profit (as a percent) 1.304% 1.393%
Internal floor (in bps)   29.7
Weighted Average | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.50% 7.00%
Conditional prepayment rate (CPR) | Minimum | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 1.10% 2.20%
Conditional prepayment rate (CPR) | Maximum | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 28.10% 25.00%
Conditional prepayment rate (CPR) | Weighted Average | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 5.10% 5.70%
CDR | Minimum | Level 3 | Total | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 3.20% 3.90%
CDR | Minimum | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 1.20% 1.30%
CDR | Maximum | Level 3 | Total | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 4.30% 4.40%
CDR | Maximum | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 41.00% 41.00%
CDR | Weighted Average | Level 3 | Total | Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 4.10% 4.30%
CDR | Weighted Average | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 10.50% 10.70%
Loss severity | Minimum | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 45.00% 45.00%
Loss severity | Maximum | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 100.00% 100.00%
Loss severity | Weighted Average | Valuation, Income Approach | Level 3 | FG VIEs' assets    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 83.50% 83.20%
Obligations of state and political subdivisions | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 10 $ 10
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) 5.30% 5.50%
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) 15.00% 22.00%
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) 6.70% 7.50%
Corporate securities | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 168  
Corporate securities | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 5.30%  
Corporate securities | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 8.30%  
Corporate securities | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 5.40%  
RMBS | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 145 $ 145
RMBS | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 7.00% 7.70%
RMBS | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 10.00% 10.80%
RMBS | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 8.40% 9.10%
RMBS | Conditional prepayment rate (CPR) | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 0.00% 1.80%
RMBS | Conditional prepayment rate (CPR) | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 17.90% 17.00%
RMBS | Conditional prepayment rate (CPR) | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 3.90% 2.80%
RMBS | CDR | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 1.20% 1.80%
RMBS | CDR | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 18.60% 18.70%
RMBS | CDR | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 5.40% 5.40%
RMBS | Loss severity | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 50.00% 50.00%
RMBS | Loss severity | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 125.00% 125.00%
RMBS | Loss severity | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 79.90% 79.90%
CLOs | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 472 $ 611
CLOs | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 10.20% 12.50%
CLOs | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 23.50% 22.50%
CLOs | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 17.80% 17.90%
CLOs | Discount margin | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 1.00% 0.80%
CLOs | Discount margin | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 2.90% 2.90%
CLOs | Discount margin | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 1.80% 1.90%
Others | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 49 $ 420
Others | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 9.70% 6.40%
Others | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent)   9.10%
Others | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.70%
Fixed-maturity securities, trading | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 4 $ 5
Fixed-maturity securities, trading | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 4.20% 19.80%
Fixed-maturity securities, trading | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 7.70% 169.50%
Fixed-maturity securities, trading | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.00% 163.80%
Consolidated Investment Vehicles | Valuation, Income Approach | Level 3 | Assets of CIVs - equity securities (3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 132 $ 99
Consolidated Investment Vehicles | Discount margin | Valuation, Income Approach | Level 3 | Assets of CIVs - equity securities (3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 23.40% 24.30%
Consolidated Investment Vehicles | Measurement input, revenue multiple | Valuation, Market Approach | Level 3 | Assets of CIVs - equity securities (3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Market multiple-price to book 100.00% 105.00%
Market multiple-price to earnings 575.00% 525.00%
Consolidated Investment Vehicles | Terminal growth rate | Valuation, Income Approach | Level 3 | Assets of CIVs - equity securities (3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 4.00% 4.00%
Consolidated Investment Vehicles | Exit multiple-price to book | Valuation, Market Approach | Level 3 | Assets of CIVs - equity securities (3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 100.00% 105.00%
Consolidated Investment Vehicles | Exit multiple-price to earnings | Valuation, Market Approach | Level 3 | Assets of CIVs - equity securities (3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 550.00% 550.00%
Other assets | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 12 $ 2
Term (years) 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%  
Implied Yield   6.50%
Other assets | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 7.00%  
Implied Yield   7.00%
Other assets | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.70%  
Implied Yield   6.80%
Other invested assets | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 4 $ 4
FG VIEs' assets | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets carried at fair value $ 145 $ 147
FG VIEs' assets | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 6.30% 6.80%
FG VIEs' assets | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 9.90% 10.80%
FG VIEs' assets | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Yield (as a percent) 8.70% 9.30%
FG VIEs' assets | Conditional prepayment rate (CPR) | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 1.10% 2.20%
FG VIEs' assets | Conditional prepayment rate (CPR) | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 28.10% 25.00%
FG VIEs' assets | Conditional prepayment rate (CPR) | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 5.10% 5.70%
FG VIEs' assets | CDR | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 1.20% 1.30%
FG VIEs' assets | CDR | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 41.00% 41.00%
FG VIEs' assets | CDR | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 10.50% 10.70%
FG VIEs' assets | Loss severity | Minimum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 45.00% 45.00%
FG VIEs' assets | Loss severity | Maximum | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 100.00% 100.00%
FG VIEs' assets | Loss severity | Weighted Average | Valuation, Income Approach | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Conditional prepayment rate 83.50% 83.20%