Investments (excluding Consolidated Investment Entities) - Fixed Maturities and Equity Securities, Repurchase Agreements and Securities Lending (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Available-for-sale Securities, Including Securities Pledged [Line Items]
Initial collateral required, percent of market value of loaned securities	102.00%
Securities received as collateral	$ 125	$ 135
Payables under securities loan and repurchase agreements, including collateral held	$ 1,328	1,302
Single issuer in excess of total equity	no
Collateral Pledged
Available-for-sale Securities, Including Securities Pledged [Line Items]
Securities pledged	$ 1,226	1,162
Securities pledged as collateral
Available-for-sale Securities, Including Securities Pledged [Line Items]
Securities pledged under repurchase agreements, carrying value	113	113
Fair value of loaned securities	976	907
Short-term Investments
Available-for-sale Securities, Including Securities Pledged [Line Items]
Securities received as collateral	879	807
Cash collateral, included in Payables
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	$ 879	$ 807
Mortgage-backed securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Percent collateralized mortgage backed securities including interest-only strip or principal-only strip	45.20%	41.60%
U.S. Treasuries
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	$ 7	$ 53
U.S. corporate public securities
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	700	604
Foreign corporate public securities and foreign governments
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	297	285
Payables under securities loan agreements
Available-for-sale Securities, Including Securities Pledged [Line Items]
Payables under securities loan and repurchase agreements, including collateral held	1,004	942
Fixed maturities \| Collateral Pledged
Available-for-sale Securities, Including Securities Pledged [Line Items]
Securities pledged	$ 1,226	$ 1,162

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 45
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI https://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=127002003&loc=SL6242269-115581

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