Investments - Allowance for credit losses (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2026	Dec. 31, 2025	Dec. 31, 2024
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	$ 13	$ 17	$ 30
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	1	7
Reductions for securities sold during the period	(5)	(20)
Private Equity Funds, US
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	1	6	3
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	0	6
Reductions for securities sold during the period	(5)	(3)
Commercial mortgage-backed
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0	17
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	0	0
Reductions for securities sold during the period	0	(17)
Foreign corporate public securities and foreign governments
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	1	1	1
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	0	0
Reductions for securities sold during the period	0	0
Private Equity Funds, Non-US
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	8	8	8
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	0	0
Reductions for securities sold during the period	0	0
Residential mortgage-backed
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	0	0
Other asset-backed securities
Allowance for Loan and Lease Losses [Roll Forward]
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Excluding Accrued Interest	3	2	$ 1
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss, Not Previously Recorded	1	1
Reductions for securities sold during the period	$ 0	$ 0

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

+ Details

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- Definition

Amount, excluding accrued interest, of credit loss expense on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with no credit loss previously recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

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