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Long-duration Contracts - Significant Inputs and Assumptions (Details) $ in Millions	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
Market Risk Benefit [Line Items]
Net liability	$ 2,762	$ 2,855	$ 2,674
Nonperformance risk | Discounted cash flow | Minimum
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.004		0.005
Nonperformance risk | Discounted cash flow | Maximum
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.018		0.020
Nonperformance risk | Discounted cash flow | Weighted average
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.015		0.016
Option budget | Discounted cash flow | Minimum
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.005		0.005
Option budget | Discounted cash flow | Maximum
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.057		0.040
Option budget | Discounted cash flow | Weighted average
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.018		0.016
Surrender rate | Discounted cash flow | Minimum
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.033		0.033
Surrender rate | Discounted cash flow | Maximum
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.069		0.068
Surrender rate | Discounted cash flow | Weighted average
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.045		0.045
Measurement Input, Utilization Rate | Discounted cash flow | Minimum
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.286		0.286
Measurement Input, Utilization Rate | Discounted cash flow | Maximum
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.950		0.950
Measurement Input, Utilization Rate | Discounted cash flow | Weighted average
Market Risk Benefit [Line Items]
Market risk benefit, measurement input (in percent)	0.831		0.816

X

- Definition

Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (h)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480016/944-40-65-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
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-Name Accounting Standards Codification
-Section 55
-Paragraph 29G
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 7B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480112/944-40-45-3

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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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29G
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 7B
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B

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- Definition

Value of measurement input used to measure contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
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