Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets held in separate accounts	$ 80,174	$ 100,433
Derivatives	389	231
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	30,357	37,251
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,454	2,607
Derivatives	422	171
Other Investments	68	79
Assets held in separate accounts	80,174	100,433
Short-term debt	141	1
Long-term debt	2,094	2,595
Equity Securities, FV-NI	336	240
Carrying Value | Embedded derivatives on reinsurance .
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	95	0
Derivatives	46	196
Carrying Value | Other Credit Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	389	231
Carrying Value | Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	35,707	35,334
Carrying Value | Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	1,285	1,460
Carrying Value | Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	727	829
Carrying Value | Guaranteed benefit derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	30	48
Carrying Value | Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,445	5,627
Carrying Value | Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	363	392
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed maturities, including securities pledged	30,357	37,251
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,454	2,607
Derivatives	422	171
Other Investments	68	79
Assets held in separate accounts	80,174	100,433
Short-term debt	142	1
Long-term debt	1,935	2,991
Equity Securities, FV-NI	336	240
Fair Value | Embedded derivatives on reinsurance .
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	95	0
Derivatives	46	196
Fair Value | Other Credit Derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivatives	389	231
Fair Value | Funding agreements without fixed maturities and deferred annuities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	36,385	43,407
Fair Value | Funding agreements with fixed maturities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	1,281	1,461
Fair Value | Supplementary contracts, immediate annuities and other
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	636	775
Fair Value | Guaranteed benefit derivatives
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Guaranteed benefit derivatives:	30	48
Fair Value | Mortgage loans on real estate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	5,149	5,982
Fair Value | Policy loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans	$ 363	$ 392