Investments (excluding Consolidated Investment Entities) - Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, including securities pledged, Amortized Cost Basis	$ 30,656	$ 37,531
Fixed maturities, including securities pledged	33,699	43,569
Fixed maturities
Available-for-sale Securities, Including Securities Pledged [Line Items]
One year or less, Amortized Cost	588
One year or less, Fair Value	595
After one year through five years, Amortized Cost	4,576
After one year through five years, Fair Value	4,790
After five years through ten years, Amortized Cost	5,444
After five years through ten years, Fair Value	5,957
After ten years, Amortized Cost	13,209
After ten years, Fair Value	15,343
Fixed maturities, including securities pledged, Amortized Cost Basis	34,101	40,897
Fixed maturities, including securities pledged	37,251	47,029
Mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Without single maturity date, Amortized Cost	8,215
Without single maturity date, Fair Value	8,485
Other asset-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Without single maturity date, Amortized Cost	2,069
Without single maturity date, Fair Value	2,081
Fixed maturities, including securities pledged, Amortized Cost Basis	2,069	2,110
Fixed maturities, including securities pledged	$ 2,081	$ 2,138