v3.26.1
Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held in separate accounts $ 119,424 $ 113,007
Derivatives 248 282
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 29,333 30,151
Equity securities 202 201
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,151 2,357
Derivatives 197 197
Other investments 89 86
Assets held in separate accounts 119,424 113,007
Short-term debt 153 586
Long-term debt 1,950 1,518
Carrying Value | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 50 55
Derivatives (10) (9)
Carrying Value | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 8 5
Carrying Value | Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 248 282
Carrying Value | Funding agreements without fixed maturities and deferred annuities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 33,102 33,793
Carrying Value | Funding agreements with fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 2,251 2,101
Carrying Value | Supplementary contracts and immediate annuities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 488 504
Carrying Value | Mortgage loans on real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans 5,484 5,608
Carrying Value | Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans 312 323
Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 29,333 30,151
Equity securities 202 201
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,151 2,357
Derivatives 197 197
Other investments 89 86
Assets held in separate accounts 119,424 113,007
Short-term debt 154 588
Long-term debt 1,920 1,489
Estimate of Fair Value Measurement | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 50 55
Derivatives (10) (9)
Estimate of Fair Value Measurement | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 8 5
Estimate of Fair Value Measurement | Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 248 282
Estimate of Fair Value Measurement | Funding agreements without fixed maturities and deferred annuities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 35,804 37,154
Estimate of Fair Value Measurement | Funding agreements with fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 2,261 2,120
Estimate of Fair Value Measurement | Supplementary contracts and immediate annuities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 468 481
Estimate of Fair Value Measurement | Mortgage loans on real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans 5,356 5,522
Estimate of Fair Value Measurement | Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans $ 312 $ 323