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Reinsurance - Coverage and retention (Details) - Variable Interest Entity, Not Primary Beneficiary
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance $ 1,969
Current Coverage 811
Remaining Retention, Net $ 952
Amortization period 10 years
Bellemeade 2021-3 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance $ 639 [1]
Current Coverage 35 [1]
Remaining Retention, Net 130 [1]
Bellemeade 2021-3 Ltd | Funded By VIE  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 508
Bellemeade 2021-3 Ltd | Directly provided capacity  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 131
Bellemeade 2022-1 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 317 [2]
Current Coverage 54 [2]
Remaining Retention, Net 135 [2]
Bellemeade 2022-1 Ltd | Funded By VIE  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 284
Bellemeade 2022-1 Ltd | Directly provided capacity  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 33
Bellemeade 2022-2 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 327 [3]
Current Coverage 134 [3]
Remaining Retention, Net 187 [3]
Bellemeade 2022-2 Ltd | Funded By VIE  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 201
Bellemeade 2022-2 Ltd | Directly provided capacity  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 126
Bellemeade 2023-1 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 233 [4]
Current Coverage 186 [4]
Remaining Retention, Net 164 [4]
Bellemeade 2023-1 Ltd | Funded By VIE  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 186
Bellemeade 2023-1 Ltd | Directly provided capacity  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 47
Bellemeade 2024-1 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 204 [5]
Current Coverage 163 [5]
Remaining Retention, Net 170 [5]
Bellemeade 2024-1 Ltd | Funded By VIE  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 163
Bellemeade 2024-1 Ltd | Directly provided capacity  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 41
Bellemeade 2025-1 Ltd  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 249 [6]
Current Coverage 239 [6]
Remaining Retention, Net 166 [6]
Bellemeade 2025-1 Ltd | Funded By VIE  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance 199
Bellemeade 2025-1 Ltd | Directly provided capacity  
Variable Interest Entity [Line Items]  
Initial Coverage at Issuance $ 50
[1] Issued in September 2021, covering in-force policies issued between April 1, 2021 and June 30, 2021. $508 million was directly funded by Bellemeade Re 2021-3 Ltd. via insurance-linked notes, with an additional $131 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.
[2] Issued in January 2022, covering in-force policies issued between July 1, 2021 and November 30, 2021. $284 million was directly funded by Bellemeade Re 2022-1 Ltd. via insurance-linked notes, with an additional $33 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.
[3] Issued in September 2022, covering in-force policies issued between November 1, 2021 and June 30, 2022. $201 million was directly funded by Bellemeade Re 2022-2 Ltd. via insurance-linked notes, with an additional $126 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.
[4] Issued in October 2023, covering in-force policies issued between January 1, 2023 and September 30, 2023. $186 million was directly funded by Bellemeade Re 2023-1 Ltd. via insurance-linked notes, with an additional $47 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.
[5] Issued in August 2024, covering in-force policies issued between September 1, 2023 and July 31, 2024. $163 million was directly funded by Bellemeade Re 2024-1 Ltd. via insurance-linked notes, with an additional $41 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers.
[6] Issued in November 2025, covering in-force policies issued between July 1, 2024 and September 30, 2025. $199 million was directly funded by Bellemeade Re 2025-1 Ltd. via insurance-linked notes, with an additional $50 million capacity provided directly to Arch MI U.S. by a separate panel of reinsurers