COMMITMENTS AND CONTINGENT LIABILITIES - Additional Information (Detail) - 12 months ended Dec. 31, 2024 $ in Millions, ¥ in Billions	JPY (¥) agreements	USD ($) agreements
Commitments and Contingencies Disclosure [Line Items]
Number of operating service agreements, management consulting and technology services	3	3
Number of operating service agreements, information technology and data services	2	2
Technology and consulting company mainframe and server computer operations and support
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term	4 years	4 years
Outsourcing agreements, aggregate remaining cost	¥ 43.4	$ 274
Management consulting and technology services company application maintenance and development services
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term	4 years	4 years
Outsourcing agreements, aggregate remaining cost	¥ 14.7	$ 93
Management consulting and technology services company policy administrative services
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term	4 years	4 years
Outsourcing agreements, aggregate remaining cost	¥ 6.8	$ 43
Management consulting and technology services company comprehensive project-related support services
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term	2 years	2 years
Outsourcing agreements, aggregate remaining cost	¥ 2.3	$ 15
Information technology and data services company application maintenance and development services first agreement
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, aggregate remaining cost	1.1	7
Information technology and data services company application maintenance and development services second agreement
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, aggregate remaining cost	¥ 1.8	$ 11
Information technology and data services company enterprise software licensing
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term	2 years	2 years
Outsourcing agreements, aggregate remaining cost	¥ 1.5	$ 10
Information technology and software company application maintenance and development services
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term	1 year	1 year
Outsourcing agreements, aggregate remaining cost	¥ 0.9	$ 6
Information technology and data services company cloud hosting services
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term	3 years	3 years
Outsourcing agreements, aggregate remaining cost | $		$ 54
Cloud-based software licensing
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term	5 years	5 years
Outsourcing agreements, aggregate remaining cost	¥ 8.0	$ 51