Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets held in separate accounts	$ 93,133	$ 80,174
Derivatives	371	389
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	28,611	30,357
Equity securities	236	336
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,165	2,454
Derivatives	311	422
Other Investments	64	68
Assets held in separate accounts	93,133	80,174
Short-term debt	1	141
Long-term debt	2,097	2,094
Carrying Value | Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	9	6
Carrying Value | Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	371	389
Carrying Value | Embedded derivatives on reinsurance .
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	61	95
Derivatives	49	46
Carrying Value | Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	32,848	35,707
Carrying Value | Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	1,175	1,285
Carrying Value | Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	628	727
Carrying Value | Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,218	5,445
Carrying Value | Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	352	363
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	28,611	30,357
Equity securities	236	336
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,165	2,454
Derivatives	311	422
Other Investments	64	68
Assets held in separate accounts	93,133	80,174
Short-term debt	1	142
Long-term debt	1,998	1,935
Fair Value | Stabilizer and MCGs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	9	6
Fair Value | Other derivatives, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	371	389
Fair Value | Embedded derivatives on reinsurance .
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	61	95
Derivatives	49	46
Fair Value | Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	34,856	36,385
Fair Value | Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	1,178	1,281
Fair Value | Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment contract liabilities	571	636
Fair Value | Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	4,941	5,149
Fair Value | Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 352	$ 363