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COMMITMENTS AND CONTINGENT LIABILITIES - Additional Information (Detail) $ in Millions, ¥ in Billions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) agreements | Dec. 31, 2019 JPY (¥) agreements
Commitments and Contingencies Disclosure [Line Items] |  |  |
Number of operating service agreements, technology and consulting | agreements |  | 2 | 2
Number of operating service agreements, management consulting and technology | agreements |  | 1 | 1
Number of operating service agreements, information technology and data services | agreements |  | 2 | 2
Loss contingency accrual, insurance-related assessment, discount rate | 4.25% |  |
Loss contingency, discounted amount of insurance-related assessment liability | $ 62 |  |
Loss contingency, undiscounted amount of insurance-related assessment liability | 94 |  |
Loss contingency, insurance related assessment, discounted amount of premium tax offset | 48 |  |
Loss contingency, insurance-related assessment, undiscounted amount of premium tax offset | 74 |  |
Loss contingency, loss in period | $ 14 |  |
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 |  | $ 244 | ¥ 26.7
Technology and consulting 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 |  | $ 61 | ¥ 6.6
Management consulting and technology services company application maintenance and development services |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Outsourcing agreements, remaining term |  | 2 years | 2 years
Outsourcing agreements, aggregate remaining cost |  | $ 63 | ¥ 6.9
Information technology and data services company application maintenance and development services first agreement |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Outsourcing agreements, remaining term |  | 3 years | 3 years
Outsourcing agreements, aggregate remaining cost |  | $ 50 | ¥ 5.5
Information technology and data services company application maintenance and development services second agreement |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Outsourcing agreements, remaining term |  | 3 years | 3 years
Outsourcing agreements, aggregate remaining cost |  | $ 45 | ¥ 4.9

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