v3.26.1
Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held in separate accounts $ 108,467 $ 113,007
Derivatives 262 282
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 29,551 30,151
Equity securities 193 201
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,191 2,357
Derivatives 203 197
Other investments 90 86
Assets held in separate accounts 108,467 113,007
Short-term debt 587 586
Long-term debt 1,913 1,518
Carrying Value | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 46 55
Derivatives (9) (9)
Carrying Value | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 7 5
Carrying Value | Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 262 282
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 33,570 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 2,256 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 501 504
Carrying Value | Mortgage loans on real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans 5,664 5,608
Carrying Value | Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans 316 323
Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 29,551 30,151
Equity securities 193 201
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,191 2,357
Derivatives 203 197
Other investments 90 86
Assets held in separate accounts 108,467 113,007
Short-term debt 587 588
Long-term debt 1,826 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 46 55
Derivatives (9) (9)
Estimate of Fair Value Measurement | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 7 5
Estimate of Fair Value Measurement | Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 262 282
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 36,578 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 2,276 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 483 481
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 5,524 5,522
Estimate of Fair Value Measurement | Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans $ 316 $ 323