v3.26.3
Fair Value - Summary of Unobservable Inputs for the Embedded Derivatives of Interest Sensitive Contract Liabilities (Details)
$ in Millions
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment funds $ 32,675 $ 26,327
Level 3 | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-Sale Debt securities, Trading securities, and Equity securities 60,748 32,312
Mortgage loans, net of allowances 102,821 95,524
Investment funds 2,327 1,313
Level 3 | Recoverability    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage loans, net of allowances 215 20
Investment funds $ 287  
Level 3 | Net tangible asset values    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment funds   286
Level 3 | Reported net asset value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Investment funds   $ 5
Nonperformance risk | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, measurement input 0.004 0.004
Nonperformance risk | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, measurement input 0.011 0.010
Nonperformance risk | Weighted average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, measurement input 0.007 0.006
Option budget | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, measurement input 0.005 0.005
Option budget | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, measurement input 0.059 0.059
Option budget | Weighted average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, measurement input 0.036 0.031
Surrender rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, measurement input 0.073 0.060
Surrender rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, measurement input 0.152 0.142
Surrender rate | Weighted average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded derivative liability, measurement input 0.111 0.096
Discount rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage loans, Measurement Input 0.017 0.010
Measurement Input for Available-for-Sale Debt securities, Trading securities, and Equity securities 0.039 0.028
Investment funds, measurement input 0.140 0.130
Discount rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage loans, Measurement Input 0.388 0.315
Measurement Input for Available-for-Sale Debt securities, Trading securities, and Equity securities 0.235 0.229
Investment funds, measurement input 0.148 0.140
Discount rate | Weighted average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage loans, Measurement Input 0.074 0.065
Measurement Input for Available-for-Sale Debt securities, Trading securities, and Equity securities 0.073 0.064
Investment funds, measurement input 0.140 0.131
Embedded derivatives | Interest Sensitive Contracts | Level 3 | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total liabilities measured at fair value $ 16,413 $ 14,749