v3.25.1
Segment Information - Summary of Operations by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
REVENUES    
Revenues $ 204 $ 253
Income from equity method investments [1] 4 (5)
EXPENSES    
Net incurred losses and LAE [1] (16) (19)
Defendant asbestos and environmental expenses 4 3
Corporate and Other:    
Net incurred losses and LAE [1] 16 19
Defendant asbestos and environmental expenses (4) (3)
Amortization Of Net Deferred Charge Assets (30) (30)
General and administrative expenses (91) (87)
Interest expense (23) (22)
Net foreign exchange gains (16) 9
Income tax expense 0 (5)
Dividends on preferred shares (9) (9)
NET INCOME ATTRIBUTABLE TO ENSTAR ORDINARY SHAREHOLDERS 50 119
Operating Segments    
REVENUES    
Revenues 203 252
Income from equity method investments 4 (5)
EXPENSES    
Net incurred losses and LAE (26) (18)
Defendant asbestos and environmental expenses (1) (1)
Salaries and benefits 33 33
Professional fee expenses 7 7
Other segment expenses 12 13
Corporate and Other:    
Net incurred losses and LAE 26 18
Defendant asbestos and environmental expenses 1 1
NET INCOME ATTRIBUTABLE TO ENSTAR ORDINARY SHAREHOLDERS 182 213
Operating Segments | Run-off    
REVENUES    
Revenues 14 13
Income from equity method investments 0 0
EXPENSES    
Net incurred losses and LAE (26) (18)
Defendant asbestos and environmental expenses (1) (1)
Salaries and benefits 28 27
Professional fee expenses 6 6
Other segment expenses 8 10
Corporate and Other:    
Net incurred losses and LAE 26 18
Defendant asbestos and environmental expenses 1 1
NET INCOME ATTRIBUTABLE TO ENSTAR ORDINARY SHAREHOLDERS (1) (11)
Operating Segments | Investments    
REVENUES    
Revenues 189 239
Income from equity method investments 4 (5)
EXPENSES    
Net incurred losses and LAE 0 0
Defendant asbestos and environmental expenses 0 0
Salaries and benefits 5 6
Professional fee expenses 1 1
Other segment expenses 4 3
Corporate and Other:    
Net incurred losses and LAE 0 0
Defendant asbestos and environmental expenses 0 0
NET INCOME ATTRIBUTABLE TO ENSTAR ORDINARY SHAREHOLDERS 183 224
Corporate and Other    
REVENUES    
Revenues 1 1
EXPENSES    
Net incurred losses and LAE 10 (1)
Defendant asbestos and environmental expenses 5 4
Corporate and Other:    
Other income (expense) 1 1
Net incurred losses and LAE (10) 1
Defendant asbestos and environmental expenses (5) (4)
Amortization Of Net Deferred Charge Assets (30) (30)
General and administrative expenses (40) (35)
Interest expense (23) (22)
Net foreign exchange gains (16) 9
Income tax expense   (5)
Dividends on preferred shares (9) (9)
NET INCOME ATTRIBUTABLE TO ENSTAR ORDINARY SHAREHOLDERS $ (132) $ (94)
[1] See Note 17 for additional information regarding related party transactions.