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Business Segments (Summary Of Company's Segment Results) (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Revenues $ 25 [1] $ 33 [2] $ 72 [3] $ 98 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange (12) (5) (29) (56)  
Revenues of consolidated VIEs 2 1 9 (37)  
Inter-segment revenues 0 [5] 0 [6] 0 [7] 0 [8]  
Total revenues 15 [9] 29 [10] 52 [11] 5 [12]  
Losses and loss adjustment (50) 11 (34) 171  
Compensation and benefits 13 8 34 36  
Interest 50 53 148 158  
Inter-segment service charge 0 0 0 0  
Other segment items 9 [13] 8 [14] 29 [15] 31 [16]  
Total expenses 22 80 177 396  
Income (loss) from continuing operations before income taxes (7) (51) (125) (391)  
Total assets per reportable segment 2,050 2,218 2,050 2,218  
Assets held for sale 10 12 10 12  
Total assets 2,060 2,230 2,060 2,230 $ 2,168
Operating Segments [Member] | US Public Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues 15 20 [2] 41 [3] 55 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange 1 1 2 2  
Revenues of consolidated VIEs   0 0 0  
Inter-segment revenues 5 6 [6] 18 [7] 19 [8]  
Total revenues 21 27 [10] 61 [11] 76 [12]  
Losses and loss adjustment (54) 2 (45) 165  
Compensation and benefits 0 0 0 0  
Interest 0 0 0 0  
Inter-segment service charge 7 6 24 25  
Other segment items 3 5 [14] 10 [15] 11 [16]  
Total expenses 44 13 11 201  
Income (loss) from continuing operations before income taxes 65 14 72 (125)  
Total assets per reportable segment 1,524 1,654 1,524 1,654  
Operating Segments [Member] | Corporate Operations [Member]          
Segment Reporting Information [Line Items]          
Revenues 6 6 [2] 17 [3] 22 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange 5 7 (3) 5  
Revenues of consolidated VIEs   0 0 0  
Inter-segment revenues 11 12 [6] 38 [7] 42 [8]  
Total revenues 22 11 [10] 52 [11] 69 [12]  
Losses and loss adjustment 0 0 0 0  
Compensation and benefits 13 8 34 36  
Interest 17 19 53 55  
Inter-segment service charge 0 0 0 0  
Other segment items 5 5 [14] 13 [15] 12 [16]  
Total expenses 35 32 100 103  
Income (loss) from continuing operations before income taxes (13) (21) (48) (34)  
Total assets per reportable segment 650 646 650 646  
Operating Segments [Member] | International And Structured Finance Insurance [Member]          
Segment Reporting Information [Line Items]          
Revenues 4 [1] 6 [2] 14 [3] 21 [4]  
Net gains (losses) on financial instruments at fair value and foreign exchange 18 (1) (28) (63)  
Revenues of consolidated VIEs 2 1 9 (37)  
Inter-segment revenues 2 [5] 3 [6] 5 [7] 5 [8]  
Total revenues 10 [9] 11 [10] 0 [11] (74) [12]  
Losses and loss adjustment 4 9 11 (6)  
Compensation and benefits 0 0 0 0  
Interest 38 39 112 120  
Inter-segment service charge 4 4 11 14  
Other segment items 4 [13] 3 [14] 15 [15] 18 [16]  
Total expenses 50 55 149 158  
Income (loss) from continuing operations before income taxes (60) (44) (149) (232)  
Total assets per reportable segment 670 861 670 861  
Intersegment Elimination [Member]          
Segment Reporting Information [Line Items]          
Revenues 0 [1] 1 [2] 0 [3] 0 [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 (18) [5] (21) [6] (61) [7] (66) [8]  
Total revenues (18) [9] (20) [10] (61) [11] (66) [12]  
Losses and loss adjustment 0 0 0 0  
Compensation and benefits 0 0 0 0  
Interest (5) (5) (17) (17)  
Inter-segment service charge (11) (10) (35) (39)  
Other segment items (3) [13] (5) [14] (9) [15] (10) [16]  
Total expenses (19) (20) (61) (66)  
Income (loss) from continuing operations before income taxes (1) 0 (0) 0  
Total assets per reportable segment $ (794) [8],[17] $ (943) [18],[19] $ (794) [8],[17] $ (943) [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 $14 million, $6 million, $2 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 $16 million, $7 million, $3 million, and ($6) million for the U.S. Public Finance, Corporate, International and Structured Finance, and Eliminations segments, respectively.
[11] Includes net investment income of $44 million, $19 million, $8 million, and ($17) million for the U.S. Public Finance, Corporate, International and Structured Finance, and Eliminations segments, respectively.
[12] Includes net investment income of $51 million, $23 million, $8 million, and ($17) 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