Investments - Components of net investment income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Investment Income [Line Items]
Total investment income	$ 10,056	$ 12,020	$ 10,888
Investment expenses	480	348	372
Net investment income	9,576	11,672	10,516
Net investment income - excluding Fortitude Re funds withheld assets
Net Investment Income [Line Items]
Total investment income	9,134	10,213	9,425
Investment expenses	449	316	336
Net investment income	8,685	9,897	9,089
Fortitude
Net Investment Income [Line Items]
Total investment income	922	1,807	1,463
Investment expenses	31	32	36
Net investment income	891	1,775	1,427
Available-for-sale fixed maturity securities, including short-term investments
Net Investment Income [Line Items]
Total investment income	7,679	8,133	8,120
Available-for-sale fixed maturity securities, including short-term investments \| Net investment income - excluding Fortitude Re funds withheld assets
Net Investment Income [Line Items]
Total investment income	6,725	6,837	6,841
Available-for-sale fixed maturity securities, including short-term investments \| Fortitude
Net Investment Income [Line Items]
Total investment income	954	1,296	1,279
Other bond securities
Net Investment Income [Line Items]
Total investment income	(408)	26	72
Other bond securities \| Net investment income - excluding Fortitude Re funds withheld assets
Net Investment Income [Line Items]
Total investment income	(30)	17	66
Other bond securities \| Fortitude
Net Investment Income [Line Items]
Total investment income	(378)	9	6
Equity securities
Net Investment Income [Line Items]
Total investment income	(82)	(290)	255
Equity securities \| Net investment income - excluding Fortitude Re funds withheld assets
Net Investment Income [Line Items]
Total investment income	(82)	(290)	255
Equity securities \| Fortitude
Net Investment Income [Line Items]
Total investment income	0	0	0
Interest on mortgage and other loans
Net Investment Income [Line Items]
Total investment income	1,879	1,663	1,655
Interest on mortgage and other loans \| Net investment income - excluding Fortitude Re funds withheld assets
Net Investment Income [Line Items]
Total investment income	1,703	1,479	1,489
Interest on mortgage and other loans \| Fortitude
Net Investment Income [Line Items]
Total investment income	176	184	166
Alternative investments
Net Investment Income [Line Items]
Total investment income	845	2,169	596
Alternative investments \| Net investment income - excluding Fortitude Re funds withheld assets
Net Investment Income [Line Items]
Total investment income	675	1,851	584
Alternative investments \| Fortitude
Net Investment Income [Line Items]
Total investment income	170	318	12
Real estate
Net Investment Income [Line Items]
Total investment income	43	204	177
Real estate \| Net investment income - excluding Fortitude Re funds withheld assets
Net Investment Income [Line Items]
Total investment income	43	204	177
Real estate \| Fortitude
Net Investment Income [Line Items]
Total investment income	0	0	0
Other investments
Net Investment Income [Line Items]
Total investment income	100	115	13
Other investments \| Net investment income - excluding Fortitude Re funds withheld assets
Net Investment Income [Line Items]
Total investment income	100	115	13
Other investments \| Fortitude
Net Investment Income [Line Items]
Total investment income	$ 0	$ 0	$ 0

Investment Income, Interest and Dividend, Income (Loss)

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- Definition

Amount of expenses related to the generation of investment income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.2)
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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- Definition

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
-Paragraph 1
-Subparagraph (SX 210.7-04(2))
-URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

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+ References

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