Fair Value Measurements - Level 3 Financial Instruments (Details) - Assets measured on recurring basis - Level 3 - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Assets held in separate accounts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	$ 347	$ 316
Total Realized/Unrealized Gains (Losses) Included in Net Income	4	(14)
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0
Purchases	0	65
Issuances	0	0
Sales	(2)	(1)
Settlements	0	0
Transfers in to Level 3	0	6
Transfers out of Level 3	0	(38)
Fair Value, assets, ending balance	349	334
Change in Unrealized Gains (Losses) Included in Earnings	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0	0
Stabilizer (Investment Only) and MCG Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	(6)	(20)
Total Realized/Unrealized Gains (Losses) Included in Net Income	3	6
Total Realized/Unrealized Gains (Losses) Included in OCI	0	0
Purchases	0	0
Issuances	0	(1)
Sales	0	0
Settlements	0	0
Transfers in to Level 3	0	0
Transfers out of Level 3	0	0
Fair Value, assets, ending balance	(3)	(15)
Change in Unrealized Gains (Losses) Included in Earnings	0	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0	0
U.S. corporate public securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	13	5
Total Realized/Unrealized Gains (Losses) Included in Net Income	1	0
Total Realized/Unrealized Gains (Losses) Included in OCI		(1)
Purchases		16
Issuances		0
Sales		0
Settlements		0
Transfers in to Level 3		27
Transfers out of Level 3		0
Fair Value, assets, ending balance	14	47
Change in Unrealized Gains (Losses) Included in Earnings		0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0	(2)
U.S. corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	1,356	1,379
Total Realized/Unrealized Gains (Losses) Included in Net Income		0
Total Realized/Unrealized Gains (Losses) Included in OCI	26	(113)
Purchases	30	98
Issuances		0
Sales		0
Settlements	(48)	(40)
Transfers in to Level 3		110
Transfers out of Level 3		(10)
Fair Value, assets, ending balance	1,364	1,424
Change in Unrealized Gains (Losses) Included in Earnings		0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	26	(113)
Foreign corporate public securities and foreign governments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	2
Purchases		3
Transfers out of Level 3	(2)
Fair Value, assets, ending balance		3
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0	0
Foreign corporate private securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	339	272
Total Realized/Unrealized Gains (Losses) Included in Net Income	1	(16)
Total Realized/Unrealized Gains (Losses) Included in OCI	4	(19)
Purchases	49	42
Issuances		0
Sales		0
Settlements	(41)	(11)
Transfers in to Level 3		110
Transfers out of Level 3		0
Fair Value, assets, ending balance	352	378
Change in Unrealized Gains (Losses) Included in Earnings	1	0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	4	(19)
Residential mortgage-backed
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	20	34
Total Realized/Unrealized Gains (Losses) Included in Net Income		(7)
Total Realized/Unrealized Gains (Losses) Included in OCI		0
Purchases	28	11
Issuances		0
Sales		0
Settlements		0
Transfers in to Level 3		0
Transfers out of Level 3		(1)
Fair Value, assets, ending balance	48	37
Change in Unrealized Gains (Losses) Included in Earnings		(7)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0	0
Other asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	52	33
Total Realized/Unrealized Gains (Losses) Included in Net Income		0
Total Realized/Unrealized Gains (Losses) Included in OCI		(2)
Purchases	2	16
Issuances		0
Sales		(10)
Settlements	(1)	(1)
Transfers in to Level 3		0
Transfers out of Level 3	(20)	0
Fair Value, assets, ending balance	33	36
Change in Unrealized Gains (Losses) Included in Earnings		0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	0	(2)
Fixed maturities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	1,782	1,723
Total Realized/Unrealized Gains (Losses) Included in Net Income	2	(23)
Total Realized/Unrealized Gains (Losses) Included in OCI	30	(135)
Purchases	109	186
Issuances		0
Sales		(10)
Settlements	(90)	(52)
Transfers in to Level 3		247
Transfers out of Level 3	(22)	(11)
Fair Value, assets, ending balance	1,811	1,925
Change in Unrealized Gains (Losses) Included in Earnings	1	(7)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	30	(136)
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance	117	114
Total Realized/Unrealized Gains (Losses) Included in Net Income	(4)	(5)
Total Realized/Unrealized Gains (Losses) Included in OCI		0
Purchases		0
Issuances		0
Sales		0
Settlements		0
Transfers in to Level 3		8
Transfers out of Level 3		0
Fair Value, assets, ending balance	113	117
Change in Unrealized Gains (Losses) Included in Earnings	(3)	(6)
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI	$ 0	0
Short-term investments and cash equivalents
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, assets, beginning balance		0
Total Realized/Unrealized Gains (Losses) Included in Net Income		0
Total Realized/Unrealized Gains (Losses) Included in OCI		1
Purchases		6
Issuances		0
Sales		0
Settlements		0
Transfers in to Level 3		0
Transfers out of Level 3		0
Fair Value, assets, ending balance		7
Change in Unrealized Gains (Losses) Included in Earnings		0
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI		$ 0

Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset (liability) measured at fair value on recurring basis using unobservable input (level 3) and still held.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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- Definition

Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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