v3.26.1
Derivatives Derivatives (Effects on the Consolidated Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net     $ 93 $ (630)  
Net derivative gains (losses) $ (307) $ (584) 93 (630)  
Net Investment Income (3,014) (2,806) (6,114) (5,682)  
Net policyholder benefits and claims (6,607) (6,957) (13,630) (14,006)  
Net interest credited to PABs (951) (941) (1,884) (1,872)  
Net investment gains (losses) (407) (322) (632) (607)  
Income Statement Location [Axis]: us-gaap:EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivative gains (losses) (20) (35) 175 (228)  
Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Net Investment Income (2) (7) (4) (28)  
Net policyholder benefits and claims     0 0  
Net interest credited to PABs 0 0 0 0  
Net investment gains (losses) (10) 2 (10) 2  
Other Comprehensive Income (Loss), before Tax (82) (1,223) 273 (1,408)  
Fair Value Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net Investment Income 0 1 0 1  
Net policyholder benefits and claims (5) (6) (9) (10)  
Net interest credited to PABs (1) (1) (1) (1)  
Net investment gains (losses) (1) 0 (1) 0  
Other Comprehensive Income (Loss), before Tax (58)   (32)    
Fixed Maturities [Member] | Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Hedged Asset, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) (57)   (57)   $ (73)
Interest rate contracts | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Net Investment Income (1) (6) (2) (26)  
Net policyholder benefits and claims 0 0 0 0  
Net interest credited to PABs 0 0 0 0  
Net investment gains (losses) (11) 9 (10) 9  
Other Comprehensive Income (Loss), before Tax 10 (15) 8 (35)  
Currency Swap [Member] | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Net Investment Income (1) (1) (2) (2)  
Net policyholder benefits and claims 0 0 0 0  
Net interest credited to PABs 0 0 0 0  
Net investment gains (losses) (49) 1,070 (260) 1,418  
Other Comprehensive Income (Loss), before Tax 48 (1,071) 258 (1,420)  
Derivative [Member] | Fair Value Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net Investment Income 0   0    
Net policyholder benefits and claims 0   0    
Net interest credited to PABs 0   0    
Net investment gains (losses)     0    
Derivative [Member] | Currency Swap [Member] | Fair Value Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net Investment Income 61 (17) 52 27  
Net policyholder benefits and claims 0 0 0 0  
Net interest credited to PABs (1) (87) (8) (123)  
Net investment gains (losses) (2) 0 (2) 0  
Derivative [Member] | Interest Rate Swap [Member] | Fair Value Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net Investment Income 0 0 0 0  
Net policyholder benefits and claims 33 (2) 39 (77)  
Net interest credited to PABs (24) (9) (37) (46)  
Net investment gains (losses) 0 0 0 0  
Fixed Maturity Securities | Currency Swap [Member] | Fair Value Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net Investment Income 61 (16) 52 (26)  
Net policyholder benefits and claims 0 0 0 0  
Net interest credited to PABs (3) (87) (10) (123)  
Net investment gains (losses) 1 0 1 0  
Fixed Maturity Securities | Interest Rate Swap [Member] | Fair Value Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net Investment Income 0 0 0 0  
Net policyholder benefits and claims 28 (8) 30 (87)  
Net interest credited to PABs (23) (10) (36) (45)  
Net investment gains (losses) 0 0 0 0  
Credit forwards | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Net Investment Income 0 0 0 0  
Net policyholder benefits and claims 0 0 0 0  
Net interest credited to PABs 0 0 0 0  
Net investment gains (losses) 0 0 0 0  
Other Comprehensive Income (Loss), before Tax 0 0 0 0  
Foreign Currency hedged item | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 0 0 0 0  
Net Investment Income 0 0 0 0  
Net policyholder benefits and claims 0 0 0 0  
Net interest credited to PABs 0 0 0 0  
Net investment gains (losses) 50 (1,077) 260 (1,425)  
Other Comprehensive Income (Loss), before Tax 0 0 0 0  
Accumulated Other Comprehensive Income (Loss) | Currency Swap [Member] | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Other Comprehensive Income (Loss), before Tax (116) (108) 26 12  
Accumulated Other Comprehensive Income (Loss) | Interest Rate Swap [Member] | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Other Comprehensive Income (Loss), before Tax (24) (29) (19) 35  
Accumulated Other Comprehensive Income (Loss) | Derivative [Member] | Fair Value Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Other Comprehensive Income (Loss), before Tax (58)   (32)    
Accumulated Other Comprehensive Income (Loss) | Credit forwards | Cash Flow Hedging [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Other Comprehensive Income (Loss), before Tax 0 0 0 0  
Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net (345) (606) (195) (514)  
Net derivative gains (losses)       108  
Net Investment Income (48) (28) (80) (90)  
Net policyholder benefits and claims       (4)  
Net interest credited to PABs       (71)  
Net investment gains (losses)       0  
Other Comprehensive Income (Loss), before Tax       0  
Not Designated as Hedging Instrument [Member] | Income Statement Location [Axis]: us-gaap:EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivative gains (losses) 1 2 2 4  
Not Designated as Hedging Instrument [Member] | Income Statement Location [Axis]: us-gaap:NonoperatingIncomeExpense          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivative gains (losses) 57 55 111    
Net Investment Income 5 2      
Net policyholder benefits and claims (7) (2) (14)    
Net interest credited to PABs (36) (32) (74)    
Net investment gains (losses) 0 0 0    
Other Comprehensive Income (Loss), before Tax 0 0 0    
Equity Market Risk [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net (301) (307) (250) (220)  
Net Investment Income (48) (28) (32) (11)  
Interest Rate Risk [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net (43) (105) 6 (14)  
Net Investment Income 0 0 0 0  
Foreign Exchange [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net (49) (346) 75 (472)  
Net Investment Income 0 0 0 0  
Credit Default Swap, Buying Protection [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net (5) (7) (2) (12)  
Net Investment Income 0 0 0 0  
Credit Default Swap, Selling Protection [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 46 28 (2) 10  
Net Investment Income 0 0 0 0  
Foreign Currency hedged item | Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net 7 131 (22) 194  
Net Investment Income 0 0 0 0  
Effects of Derivatives on Consolidated Statements of Operations and Comprehensive Income (Loss) [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net (307) (584)      
Net Investment Income 51 24 (52) (106)  
Net policyholder benefits and claims (2) 4 (5) 6  
Net interest credited to PABs 35 33 73 (70)  
Net investment gains (losses) (11) 2 (11) 2  
Other Comprehensive Income (Loss), before Tax $ (140) $ (1,223) $ 241 $ (1,408)