v3.26.1
Derivative Financial Instruments - Notional and Fair Values (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivatives, Asset Fair Value $ 166 $ 178
Derivatives, Liability Fair Value 215 237
Derivatives 151 154
Derivatives 204 232
Not Designated as Hedging Instrument | Credit contracts    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Notional Amount 59  
Interest rate contracts    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Hedged Asset, Fair Value Hedge 202 213
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 1 2
Interest rate contracts | Not Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Notional Amount 13,541 12,031
Derivatives, Asset Fair Value 142 147
Derivatives, Liability Fair Value 191 215
Interest rate contracts | Fair Value Hedging [Member] | Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Notional Amount 0 0
Derivatives, Asset Fair Value 0 0
Derivatives, Liability Fair Value 0 0
Interest rate contracts | Cash flow hedges | Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Notional Amount 10 10
Derivatives, Asset Fair Value 0 0
Derivatives, Liability Fair Value 0 0
Foreign exchange contracts | Not Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Notional Amount 19 40
Derivatives, Asset Fair Value 1 0
Derivatives, Liability Fair Value 0 1
Foreign exchange contracts | Fair Value Hedging [Member] | Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Notional Amount 22 22
Derivatives, Asset Fair Value 0 0
Derivatives, Liability Fair Value 0 0
Foreign exchange contracts | Cash flow hedges | Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Notional Amount 452 422
Derivatives, Asset Fair Value 8 7
Derivatives, Liability Fair Value 13 16
Credit Risk Contract | Not Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivative, Notional Amount   61
Derivatives, Asset Fair Value 0 0
Derivatives, Liability Fair Value 0 0
Fixed maturities | Not Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivatives, Asset Fair Value 0 1
Derivatives, Liability Fair Value 3 0
Embedded derivatives within reinsurance | Not Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivatives 15 23
Derivatives 0 0
Managed Custody Guarantees | Not Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivatives, Asset Fair Value 0 0
Derivatives, Liability Fair Value 1 0
Stabilizer | Not Designated as Hedging Instrument    
Derivatives Instruments and Hedging Activities Disclosure [Line Items]    
Derivatives, Asset Fair Value 0 0
Derivatives, Liability Fair Value $ 7 $ 5