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Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets held in separate accounts $ 111,950 $ 101,676
Derivatives 288 332
Carrying Value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 29,883 27,454
Equity securities 198 246
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,343 2,535
Derivatives 185 303
Other investments, including securities pledged 73 74
Assets held in separate accounts 111,950 101,676
Short-term debt 586 399
Long-term debt 1,518 2,103
Carrying Value | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 62 55
Derivatives 33 41
Carrying Value | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 6 19
Carrying Value | Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 288 332
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 34,170 31,082
Carrying Value | Funding agreements with fixed maturities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 1,501 1,249
Carrying Value | Supplementary contracts and immediate annuities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Guaranteed benefit derivatives 531 570
Carrying Value | Mortgage loans on real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans 5,414 4,699
Carrying Value | Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans 327 342
Estimate of Fair Value Measurement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturities, including securities pledged 29,883 27,454
Equity securities 198 246
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements 2,343 2,535
Derivatives 185 303
Other investments, including securities pledged 73 74
Assets held in separate accounts 111,950 101,676
Short-term debt 589 399
Long-term debt 1,504 2,023
Estimate of Fair Value Measurement | Embedded derivatives within reinsurance    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 62 55
Derivatives 33 41
Estimate of Fair Value Measurement | Stabilizer and MCGs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 6 19
Estimate of Fair Value Measurement | Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives 288 332
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 37,612 32,877
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 1,507 1,257
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 491 515
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 5,297 4,459
Estimate of Fair Value Measurement | Policy loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Corporate loans $ 327 $ 342