Investments, Available-for-sale Impairment Losses Recognized in Earnings (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Available-For-Sale Impairment Losses [Abstract]
(Gain) loss on mortgage loans due to changes in expected credit losses	$ (10)	$ 21
Available-for-sale Securities
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	31	111	$ 44
Change in unrealized gains on fixed maturity securities	(1,300)	1,600	2,600
Corporate bonds and other \| Available-for-sale Securities
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	11	87	33
Asset-backed \| Available-for-sale Securities
Available-For-Sale Impairment Losses [Abstract]
Impairment losses recognized in earnings	$ 20	$ 24	$ 11

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 8A
-URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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Amount of unrealized gain (loss) on investment.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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