Investments - Changes in unrealized appreciation (depreciation) of available for sale securities and other investments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Net gains (losses) recognized during the period on equity securities and other investments	$ 1	$ 250	$ 109	$ 313
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period	(6)	13	28	28
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date	7	237	81	285
Continuing Operations, Excluding Held-For-Sale
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Increase (decrease) in unrealized appreciation (depreciation) of investments	1,045	1,585	(1,517)	3,604
Fixed maturity securities
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Increase (decrease) in unrealized appreciation (depreciation) of investments	1,045	1,585	(1,517)	3,604
Other investments
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Increase (decrease) in unrealized appreciation (depreciation) of investments	0	0	0	0
Equities
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Net gains (losses) recognized during the period on equity securities and other investments	14	30	3	28
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period	(6)	16	24	32
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date	20	14	(21)	(4)
Other invested assets
Increase (decrease) in unrealized appreciation (depreciation) of investments:
Net gains (losses) recognized during the period on equity securities and other investments	(13)	220	106	285
Less: Net gains (losses) recognized during the period on equity securities and other investments sold during the period	0	(3)	4	(4)
Unrealized gains (losses) recognized during the reporting period on equity securities and other investments still held at the reporting date	$ (13)	$ 223	$ 102	$ 289

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

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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/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

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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
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(d)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

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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
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-11

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