Investments (Net Investment Gains Losses - Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Debt and Equity Securities, Realized Gain (Loss)	$ (508)	$ (142)
Equity Securities, FV-NI, Unrealized Gain (Loss)	41	(20)
Net investment gains (losses)	(684)	(517)
Foreign Currency Transaction Gain (Loss), Realized	41	123
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	40	(24)
Cash Flow Hedging [Member]
Debt Securities, Available-for-sale [Line Items]
Net investment gains (losses)	$ 2	$ 16

Amount of realized gain (loss) on investment in debt and equity securities.

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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
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-Section 50
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-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714

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Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124440516&loc=d3e30840-110895

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Amount of realized and unrealized gain (loss) on investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 10
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-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27405-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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-Publisher FASB
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-Topic 230
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-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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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

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