Insurance Liabilities - Universal life policies (Details) - Universal Life - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
Account value	$ 3,514	$ 3,313
Net amount at risk	$ 69,335	$ 65,801
Average attained age of contract holders by product	53 years	53 years

Net Amount at Risk by Product and Guarantee, General Account And Separate Account Value

No definition available.

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Net amount at risk, representing the guaranteed benefit in excess of the current account balance corresponding to the specified product, guarantee type and subset of the guarantee.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 80
-Section 50
-Paragraph 1
-Subparagraph (d)(3),(5)
-URI https://asc.fasb.org/extlink&oid=124508989&loc=d3e19393-158473

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 55
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=124504833&loc=d3e7104-158389

+ Details

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- Definition

Weighted average attained age of policyholders or contract holders in the specified guarantee type and subset of guarantee class, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 80
-Section 50
-Paragraph 1
-Subparagraph ((d)(5))
-URI https://asc.fasb.org/extlink&oid=124508989&loc=d3e19393-158473

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 55
-Paragraph 15
-URI https://asc.fasb.org/extlink&oid=124504833&loc=d3e7104-158389

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