COMMITMENTS AND CONTINGENT LIABILITIES - Additional Information (Detail) individual in Thousands, $ in Millions, ¥ in Billions	1 Months Ended	12 Months Ended
	Dec. 31, 2025 individual agreements	Dec. 31, 2025 JPY (¥) agreements	Dec. 31, 2025 USD ($) agreements
Commitments and Contingencies Disclosure [Line Items]
Number of individuals involved in cybersecurity incident | individual	22,650
Number of operating service agreements, management consulting and technology services	3	3	3
Number of operating service agreements, information technology and data services	2	2	2
Technology and consulting company mainframe and server computer operations and support
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term		3 years	3 years
Outsourcing agreements, aggregate remaining cost		¥ 33.6	$ 215
Management consulting and technology services company application maintenance and development services
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term		3 years	3 years
Outsourcing agreements, aggregate remaining cost		¥ 12.7	$ 81
Management consulting and technology services company policy administrative services
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term		3 years	3 years
Outsourcing agreements, aggregate remaining cost		¥ 5.2	$ 33
Management consulting and technology services company comprehensive project-related support services
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term		1 year	1 year
Outsourcing agreements, aggregate remaining cost		¥ 1.3	$ 8
Information technology and data services company application maintenance and development services first agreement
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term		2 years	2 years
Outsourcing agreements, aggregate remaining cost		¥ 7.8	$ 50
Information technology and data services company application maintenance and development services second agreement
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term		2 years	2 years
Outsourcing agreements, aggregate remaining cost		¥ 9.3	$ 59
Information technology and data services company cloud hosting services
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term		1 year	1 year
Outsourcing agreements, aggregate remaining cost | $			$ 32
Cloud-based software company cloud-based software licensing
Commitments and Contingencies Disclosure [Line Items]
Outsourcing agreements, remaining term		4 years	4 years
Outsourcing agreements, aggregate remaining cost		¥ 6.6	$ 42