Investments (excluding Consolidated Investment Entities) - Debt Maturities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Available-for-sale Securities, Including Securities Pledged [Line Items]
Fixed maturities, Amortized Cost	$ 26,536	$ 27,690
Fixed maturities, single issuers in excess of total equity	no	no
Fixed maturities
Available-for-sale Securities, Including Securities Pledged [Line Items]
One year or less, Amortized Cost	$ 607
After one year through five years, Amortized Cost	3,946
After five years through ten years, Amortized Cost	3,723
After ten years, Amortized Cost	11,609
Fixed maturities, Amortized Cost	30,050	$ 30,998
One year or less, Fair Value	581
After one year through five years, Fair Value	3,819
After five years through ten years, Fair Value	3,590
After ten years, Fair Value	10,092
Fixed maturities, Fair Value	27,454	28,611
Mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Without single maturity date, Amortized Cost	7,386
Without single maturity date, Fair Value	6,603
Other asset-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Without single maturity date, Amortized Cost	2,779
Fixed maturities, Amortized Cost	2,779	2,528
Without single maturity date, Fair Value	2,769
Fixed maturities, Fair Value	$ 2,769	$ 2,470

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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