Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets held in separate accounts	$ 101,676	$ 93,133
Derivatives	332	371
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	27,454	28,611
Equity securities	246	236
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,535	2,165
Derivatives	303	311
Other Investments	74	64
Assets held in separate accounts	101,676	93,133
Short-term debt	399	1
Long-term debt	2,103	2,097
Carrying Value | Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	19	9
Carrying Value | Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	332	371
Carrying Value | Embedded derivatives on reinsurance .
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	55	61
Derivatives	41	49
Carrying Value | Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	31,082	32,848
Carrying Value | Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	1,249	1,175
Carrying Value | Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	570	628
Carrying Value | Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,699	5,218
Carrying Value | Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	342	352
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	27,454	28,611
Equity securities	246	236
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,535	2,165
Derivatives	303	311
Other Investments	74	64
Assets held in separate accounts	101,676	93,133
Short-term debt	399	1
Long-term debt	2,023	1,998
Fair Value | Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	19	9
Fair Value | Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	332	371
Fair Value | Embedded derivatives on reinsurance .
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	55	61
Derivatives	41	49
Fair Value | Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	32,877	34,856
Fair Value | Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	1,257	1,178
Fair Value | Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	515	571
Fair Value | Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,459	4,941
Fair Value | Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 342	$ 352