Fair Value Measurements (excluding Consolidated Investment Entities) - Other Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held in separate accounts	$ 75,980	$ 100,433
Derivatives	383	231
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, including securities pledged	31,039	37,251
Equity securities	337	240
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,038	2,607
Derivatives	495	171
Other investments	71	79
Assets held in separate accounts	75,980	100,433
Short-term debt	141	1
Long-term debt	2,094	2,595
Carrying Value | Other derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	383	231
Carrying Value | Embedded derivative on reinsurance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivatives	109	0
Embedded Derivative, Fair Value of Embedded Derivative Liability	74	196
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	36,263	35,334
Carrying Value | Funding agreements with fixed maturities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Guaranteed benefit derivatives	1,369	1,460
Carrying Value | Supplementary contracts, immediate annuities and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Guaranteed benefit derivatives	746	829
Carrying Value | Guaranteed benefit derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Guaranteed benefit derivatives	33	48
Carrying Value | Mortgage loans on real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	5,408	5,627
Carrying Value | Policy loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	368	392
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed maturities, including securities pledged	31,039	37,251
Equity securities	337	240
Cash and cash equivalents, short-term investments and short-term investments under securities loan agreements	2,038	2,607
Derivatives	495	171
Other investments	71	79
Assets held in separate accounts	75,980	100,433
Short-term debt	142	1
Long-term debt	1,932	2,991
Estimate of Fair Value Measurement | Other derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	383	231
Estimate of Fair Value Measurement | Embedded derivative on reinsurance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Embedded Derivatives	109	0
Embedded Derivative, Fair Value of Embedded Derivative Liability	74	196
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	36,488	43,407
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	1,367	1,461
Estimate of Fair Value Measurement | Supplementary contracts, immediate annuities and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Guaranteed benefit derivatives	650	775
Estimate of Fair Value Measurement | Guaranteed benefit derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Guaranteed benefit derivatives	33	48
Estimate of Fair Value Measurement | Mortgage loans on real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	5,061	5,982
Estimate of Fair Value Measurement | Policy loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	$ 368	$ 392