Investments - Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 44	$ 62	$ 31
Change in unrealized gains on fixed maturity securities	1,400	(7,900)	(1,300)
Mortgage Loans
Available-For-Sale Impairment Losses [Abstract]
(Gain) loss on mortgage loans due to changes in expected credit losses	11	8	(10)
Corporate bonds and other
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	33	62	11
Asset-backed
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 11		$ 20

Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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