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Leases - Additional information regarding leases (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease costs |  | $ 32 | $ 34 |
Sublease income | [1] | (2) | (2) |
Cash payments included in the measurement of lease liabilities reported in operating cash flows |  | 31 | 30 |
Right-of-use assets obtained in exchange for new lease liabilities |  | 13 | 30 |
Right-of-use assets | [2] | 120 | 129 |
Operating lease liability | [2] | $ 156 | $ 163 |
Weighted average discount rate |  | 5.00% | 4.90% |
Weighted average remaining lease term |  | 7 years 1 month 6 days | 7 years 2 months 12 days |
Balance sheet location of right of use asset |  | Other assets | Other assets |
Balance sheet location of operating lease liability |  | Other liabilities | Other liabilities |
Rental expense |  | $ 36 | $ 35 | $ 38
Maximum |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Remaining term of operating leases |  | 12 years |  |
[1] | The sublease income primarily relates to office property in Raleigh, North Carolina.
[2] | The right-of-use assets are included in ‘other assets’ while the operating lease liability is included in ‘other liabilities.’

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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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