Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - Market Value [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	$ 2,164	$ 1,526	$ 2,068	$ 1,330
Total gains or (losses) (realized/unrealized) Included in earnings	(2)		9	(19)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	59	(2)	(28)	10
Purchases, issuances and settlements	186	279	358	482
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	(779)		(779)
Ending balance	1,628	1,803	1,628	1,803
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	(3)	(2)		(24)
Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	863	706	801	701
Total gains or (losses) (realized/unrealized) Included in earnings	(2)	3	9	(12)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	(6)	(1)	(13)	6
Purchases, issuances and settlements	27	87	(43)	99
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	(163)		(35)
Ending balance	719	794	719	794
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	(3)	1	(8)	(16)
Asset Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	1,255	815	1,251	623
Total gains or (losses) (realized/unrealized) Included in earnings		(3)		(7)
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)	65		(11)	4
Purchases, issuances and settlements	159	192	387	384
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	(587)		(735)
Ending balance	893	1,004	893	1,004
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date		(3)	8	(8)
CMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	6
Total gains or (losses) (realized/unrealized) Included in earnings
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)
Purchases, issuances and settlements			6
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	(6)		(6)
Ending balance
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date
Foreign Corporate Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance fixed maturities	40	5	16	6
Total gains or (losses) (realized/unrealized) Included in earnings
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)			(4)
Purchases, issuances and settlements			8	(1)
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	(24)		(4)
Ending balance	16	5	16	5
The amount of total gains or losses for the period included in earnings (or changes in net assets) attributable to the change in unrealized gains or losses relating to assets still held at the reporting date

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.

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 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
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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).

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of purchases, (sales), issuances and (settlements) 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 transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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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.

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