Derivative Financial Instruments - Net Realized Gains (Losses) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivatives, Fair Value [Line Items]
Net investment income	$ 522	$ 731	$ 1,733	$ 2,101
Other net gains (losses)	(111)	(103)	(614)	1,602
Amount of Gain or (Loss) Recognized in Other Comprehensive Income	218	32	526	73
Interest rate contracts \| Other Comprehensive Income (Loss) \| Designated as Hedging Instrument \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income	0	0	(2)	(1)
Interest rate contracts \| Net investment income \| Designated as Hedging Instrument \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income	0	0	0	0
Foreign exchange contracts \| Other Comprehensive Income (Loss) \| Designated as Hedging Instrument \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income	64	24	126	36
Foreign exchange contracts \| Net investment income \| Fair Value Hedging
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income	0	0	0	0
Foreign exchange contracts \| Net investment income \| Designated as Hedging Instrument \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income	4	3	9	2
Amount of Gain or (Loss) Recognized in Other Comprehensive Income	4	3	9	7
Foreign exchange contracts \| Net investment income \| Designated as Hedging Instrument \| Fair Value Hedging
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income	0	0	0	0
Foreign exchange contracts \| Other net gains/(losses) \| Fair Value Hedging
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income	(6)	(2)	(13)	(3)
Foreign exchange contracts \| Other net gains/(losses) \| Designated as Hedging Instrument \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income	0	0	0	(5)
Foreign exchange contracts \| Other net gains/(losses) \| Designated as Hedging Instrument \| Fair Value Hedging
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income	6	2	14	3
Embedded derivative on reinsurance
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income	57	$ 18	233	41
Embedded derivative on reinsurance \| Level 3 \| Measured at fair value on a recurring basis
Derivatives, Fair Value [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	$ 0		$ 1	$ 0

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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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

No definition available.

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Amount of gain (loss) recognized in income from asset and liability 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
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Amount of gain (loss) included in earnings for investments classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
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