Derivatives and Hedge Accounting - Balance sheet location (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fixed maturity securities
Derivative [Line Items]
Carrying amount of hedged assets	$ 6,312	$ 7,412
Commercial mortgage and other loans
Derivative [Line Items]
Carrying amount of hedged assets	0	0
Policyholder contract deposits
Derivative [Line Items]
Carrying amount of hedged liabilities	(5,244)	(4,756)
Cumulative Amount of Fair Value Hedging Adjustments Included In the Carrying Amount of the Hedged Assets Liabilities \| Fixed maturity securities
Derivative [Line Items]
Carrying amount of hedged assets	0	0
Cumulative Amount of Fair Value Hedging Adjustments Included In the Carrying Amount of the Hedged Assets Liabilities \| Commercial mortgage and other loans
Derivative [Line Items]
Carrying amount of hedged assets	(23)	(24)
Cumulative Amount of Fair Value Hedging Adjustments Included In the Carrying Amount of the Hedged Assets Liabilities \| Policyholder contract deposits
Derivative [Line Items]
Carrying amount of hedged liabilities	$ (84)	$ 31

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-5

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4EE
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-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4EE

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