v3.25.2
Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Revenues $ 25 [1] $ 31 [2] $ 47 [3] $ 65 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange (2) (55) (17) (51)  
Revenues of consolidated VIEs   (13) 7 (38)  
Inter-segment revenues 0 [5] 0 [6] 0 [7] 0 [8]  
Total revenues 23 [9] (37) [10] 37 [11] (24) [12]  
Losses and loss adjustment 8 142 16 160  
Compensation and benefits 12 9 21 28  
Interest 48 53 98 105  
Inter-segment service charge 0 0 0 0  
Other segment items 11 [13] 12 [14] 20 [15] 23 [16]  
Total expenses 79 216 155 316  
Income (loss) from continuing operations before income taxes (56) (253) (118) (340)  
Total assets per reportable segment 2,123 2,233 2,123 2,233  
Assets held for sale 11 71 11 71  
Total assets 2,134 2,304 2,134 2,304 $ 2,168
Operating Segments [Member] | US Public Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues 15 [1] 16 [2] 26 [3] 35 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange 1 0 1 1  
Revenues of consolidated VIEs   0 0 0  
Inter-segment revenues 7 [5] 7 [6] 13 [7] 13 [8]  
Total revenues 23 [9] 23 [10] 40 [11] 49 [12]  
Losses and loss adjustment 6 141 9 163  
Compensation and benefits 0 0 0 0  
Interest 0 0 0 0  
Inter-segment service charge 7 9 17 19  
Other segment items 3 [13] 3 [14] 7 [15] 6 [16]  
Total expenses 16 153 33 188  
Income (loss) from continuing operations before income taxes 7 (130) 7 (139)  
Total assets per reportable segment 1,544 1,671 1,544 1,671  
Operating Segments [Member] | Corporate Operations [Member]          
Segment Reporting Information [Line Items]          
Revenues 5 [1] 8 [2] 11 [3] 16 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange (3) 4 (8) 12  
Revenues of consolidated VIEs   0 0 0  
Inter-segment revenues 12 [5] 15 [6] 27 [7] 30 [8]  
Total revenues 14 [9] 27 [10] 30 [11] 58 [12]  
Losses and loss adjustment 0 0 0 0  
Compensation and benefits 12 9 21 28  
Interest 18 18 36 36  
Inter-segment service charge 0 0 0 0  
Other segment items 4 [13] 4 [14] 8 [15] 7 [16]  
Total expenses 34 31 65 71  
Income (loss) from continuing operations before income taxes (20) (4) (35) (13)  
Total assets per reportable segment 677 657 677 657  
Operating Segments [Member] | International And Structured Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues 5 [1] 8 [2] 10 [3] 15 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange 0 (59) (10) (64)  
Revenues of consolidated VIEs   (13) 7 (38)  
Inter-segment revenues 1 [5] 1 [6] 3 [7] 2 [8]  
Total revenues 6 [9] (63) [10] 10 [11] (85) [12]  
Losses and loss adjustment 2 1 7 (3)  
Compensation and benefits 0 0 0 0  
Interest 36 41 74 81  
Inter-segment service charge 3 6 7 10  
Other segment items 7 [13] 8 [14] 11 [15] 15 [16]  
Total expenses 48 56 99 103  
Income (loss) from continuing operations before income taxes (42) (119) (89) (188)  
Total assets per reportable segment 805 846 805 846  
Intersegment Elimination [Member]          
Segment Reporting Information [Line Items]          
Revenues 0 [1] 1 [2] 0 [3] 1 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange 0 0 0 0  
Revenues of consolidated VIEs   0 0 0  
Inter-segment revenues (20) [5] (23) [6] (43) [7] (45) [8]  
Total revenues (20) [9] (24) [10] (43) [11] (46) [12]  
Losses and loss adjustment 0 0 0 0  
Compensation and benefits 0 0 0 0  
Interest (6) (6) (12) (12)  
Inter-segment service charge (10) (15) (24) (29)  
Other segment items (3) [13] (3) [14] (6) [15] (5) [16]  
Total expenses (19) (24) (42) (46)  
Income (loss) from continuing operations before income taxes (1) 0 (1) 0  
Total assets per reportable segment $ (903) [8],[17] $ (941) [18],[19] $ (903) [8],[17] $ (941) [18],[19]  
[1] Consists primarily of net premiums earned, net investment income, net realized investment gains (losses), fees and reimbursements and other net realized gains (losses).
[2] Consists primarily of net premiums earned, net investment income, net realized investment gains (losses), fees and reimbursements and other net realized gains (losses).
[3] Consists primarily of net premiums earned, net investment income, net realized investment gains (losses), fees and reimbursements and other net realized gains (losses).
[4] Consists primarily of net premiums earned, net investment income, net realized investment gains (losses) and other net realized gains (losses).
[5] Primarily represents intercompany service charges and intercompany net investment income.
[6] Primarily represents intercompany service charges and intercompany net investment income.
[7] Primarily represents intercompany service charges and intercompany net investment income.
[8] Primarily represents intercompany service charges and intercompany net investment income.
[9] Includes net investment income of $15 million, $6 million, $3 million, and ($5) million for the U.S. Public Finance, Corporate, International and Structured Finance, and Eliminations segments, respectively.
[10] Includes net investment income of $17 million, $8 million, $2 million, and ($5) million for the U.S. Public Finance, Corporate, International and Structured Finance, and Eliminations segments, respectively.
[11] Includes net investment income of $30 million, $13 million, $6 million, and ($12) million for the U.S. Public Finance, Corporate, International and Structured Finance, and Eliminations segments, respectively.
[12] Includes net investment income of $35 million, $16 million, $5 million, and ($11) million for the U.S. Public Finance, Corporate, International and Structured Finance, and Eliminations segments, respectively.
[13] Other segment items for each reportable segment include:

a. U.S. Public Finance Insurance - amortization of DAC, professional service fees, occupancy costs and other operating expenses;

b. Corporate - professional service fees, occupancy costs and other operating expenses;

c. International and Structured Finance Insurance - expenses of consolidated VIEs, amortization of DAC, professional service fees and other operating expenses, and

d. Elimination - inter-segment amortization of DAC and inter-segment occupancy costs.
[14] Other segment items for each reportable segment include:

a. U.S. Public Finance Insurance - amortization of DAC, professional service fees, occupancy costs and other operating expenses;

b. Corporate - professional service fees, occupancy costs and other operating expenses;

c. International and Structured Finance Insurance - expenses of consolidated VIEs, amortization of DAC, professional service fees and other operating expenses, and

d. Elimination - inter-segment amortization of DAC and inter-segment occupancy costs.
[15] Other segment items for each reportable segment include:

a. U.S. Public Finance Insurance - amortization of DAC, professional service fees, occupancy costs and other operating expenses;

b. Corporate - professional service fees, occupancy costs and other operating expenses;

c. International and Structured Finance Insurance - expenses of consolidated VIEs, amortization of DAC, professional service fees and other operating expenses, and

d. Elimination - inter-segment amortization of DAC and inter-segment occupancy costs.
[16] Other segment items for each reportable segment include:

a. U.S. Public Finance Insurance - amortization of DAC, professional service fees, occupancy costs and other operating expenses;

b. Corporate - professional service fees, occupancy costs and other operating expenses;

c. International and Structured Finance Insurance - expenses of consolidated VIEs, amortization of DAC, professional service fees and other operating expenses, and

d. Elimination - inter-segment amortization of DAC and inter-segment occupancy costs.
[17] Consists principally of intercompany reinsurance balances.
[18] Consists principally of intercompany reinsurance balances.
[19] Consists principally of intercompany reinsurance balances