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Fair Value (Quantitative Information) (Details)
Sep. 30, 2025
Dec. 31, 2024
Minimum | Foreign currency exchange rate | Measurement Input, Swap Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Asset (Liability) Net, Measurement Input 130 131
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 0 - 40    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0 0
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 41 - 60    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0004 0.0004
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 61 - 115    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0 0
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 1 - 10    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0015 0.0014
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 11 - 20    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0038 0.0039
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 21 - 116    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0038 0.0039
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Utilization Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0020 0.0020
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Withdrawal Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0 0
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Long-Term Equity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.1423 0.1423
Minimum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Nonperformance risk spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0011 0.0011
Minimum | U.S. corporate and foreign corporate | Valuation Technique, Matrix Pricing | Measurement Input, Offered Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 42 47
Minimum | U.S. corporate and foreign corporate | Valuation Technique, Market Approach | Measurement Input, Quoted Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 0 13
Minimum | U.S. corporate and foreign corporate | Valuation Technique, Consensus Pricing Model | Measurement Input, Offered Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 90 47
Minimum | RMBS | Valuation Technique, Market Approach | Measurement Input, Quoted Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 33 0
Minimum | ABS & CLO | Valuation Technique, Market Approach | Measurement Input, Quoted Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 3 4
Maximum | Foreign currency exchange rate | Measurement Input, Swap Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Asset (Liability) Net, Measurement Input 204 230
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 0 - 40    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0015 0.0015
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 41 - 60    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0079 0.0079
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 61 - 115    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 1 1
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 1 - 10    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.2010 0.2010
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 11 - 20    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.15 0.15
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 21 - 116    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.15 0.15
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Utilization Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.1625 0.22
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Withdrawal Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.20 0.20
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Long-Term Equity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.2249 0.2227
Maximum | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Nonperformance risk spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0145 0.0146
Maximum | U.S. corporate and foreign corporate | Valuation Technique, Matrix Pricing | Measurement Input, Offered Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 126 126
Maximum | U.S. corporate and foreign corporate | Valuation Technique, Market Approach | Measurement Input, Quoted Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 101 102
Maximum | U.S. corporate and foreign corporate | Valuation Technique, Consensus Pricing Model | Measurement Input, Offered Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 101 100
Maximum | RMBS | Valuation Technique, Market Approach | Measurement Input, Quoted Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 197 128
Maximum | ABS & CLO | Valuation Technique, Market Approach | Measurement Input, Quoted Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 160 113
Weighted Average | Foreign currency exchange rate | Measurement Input, Swap Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative Asset (Liability) Net, Measurement Input 200 222
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 0 - 40    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0005 0.0005
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 41 - 60    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0022 0.0022
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Mortality rates: Ages 61 - 115    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0123 0.0114
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 1 - 10    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.1337 0.1286
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 11 - 20    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0817 0.0605
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Lapse rates: Durations 21 - 116    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0748 0.0820
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Utilization Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0054 0.0079
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Withdrawal Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0492 0.0477
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Long-Term Equity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.1896 0.1877
Weighted Average | Market Risk Benefits and Reinsured Market Risk Benefits direct, assumed and ceded guaranteed minimum benefits | Measurement Input, Nonperformance risk spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
MRBs and Reinsured MRBs direct, assumed and ceded guaranteed minimum benefits 0.0058 0.0064
Weighted Average | U.S. corporate and foreign corporate | Valuation Technique, Matrix Pricing | Measurement Input, Offered Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 94 92
Weighted Average | U.S. corporate and foreign corporate | Valuation Technique, Market Approach | Measurement Input, Quoted Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 94 95
Weighted Average | U.S. corporate and foreign corporate | Valuation Technique, Consensus Pricing Model | Measurement Input, Offered Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 94 96
Weighted Average | RMBS | Valuation Technique, Market Approach | Measurement Input, Quoted Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 96 95
Weighted Average | ABS & CLO | Valuation Technique, Market Approach | Measurement Input, Quoted Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-sale, Measurement Input 99 97