Investments - Schedule of changes in unrealized appreciation (depreciation) of available for sale securities and other investments (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Increase (decrease) in unrealized appreciation (depreciation) of investments	$ 4,020	$ (16,874)	$ (40,401)	$ (7,457)	$ 8,895
Net gains (losses) recognized during the period on equity securities and other investments	60	242	271	1,072
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period	34	(49)	(57)	(225)
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date	26	291	328	1,297
Fixed maturity securities
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Increase (decrease) in unrealized appreciation (depreciation) of investments	4,019	(16,874)	(40,386)	(7,457)
Equities
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Net gains (losses) recognized during the period on equity securities and other investments	29	(57)	(82)	(290)
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period	33	(46)	(46)	(255)
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date	(4)	(11)	(36)	(35)
Other Invested Assets
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Net gains (losses) recognized during the period on equity securities and other investments	31	299	353	1,362
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period	1	(3)	(11)	30
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date	30	302	364	1,332
Other investments
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Increase (decrease) in unrealized appreciation (depreciation) of investments	$ 1	$ 0	$ (15)	$ 0

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

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Amount of realized gain (loss) from sale of 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714

Reference 2: 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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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

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714

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Amount, before tax and adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563

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