COMMITMENTS AND CONTINGENT LIABILITIES	9 Months Ended
COMMITMENTS AND CONTINGENT LIABILITIES	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENT LIABILITIES	COMMITMENTS AND CONTINGENT LIABILITIES Effective for 2021, the Company entered into an outsourcing agreement with a technology and consulting company to provide mainframe computer operations for Aflac Japan. As of September 30, 2021, the agreement has a remaining term of four years and an aggregate remaining cost of ¥29.3 billion ($262 million using the September 30, 2021 exchange rate). Effective for 2021, the Company entered into an outsourcing agreement with a management consulting and technology services company to provide application maintenance and development services for Aflac Japan. As of September 30, 2021, the agreement has a remaining term of six years and an aggregate remaining cost of ¥16.9 billion ($151 million using the September 30, 2021 exchange rate). Effective for 2021, the Company entered into an enterprise agreement with an information technology and data services company to license software for Aflac Japan. As of September 30, 2021, the agreement has a remaining term of three years and an aggregate remaining cost of ¥1.8 billion ($16 million using the September 30, 2021 exchange rate). The Company is a defendant in various lawsuits considered to be in the normal course of business. Members of the Company's senior legal and financial management teams review litigation on a quarterly and annual basis. The final results of any litigation cannot be predicted with certainty. Although some of this litigation is pending in states where large punitive damages, bearing little relation to the actual damages sustained by plaintiffs, have been awarded in recent years, the Company believes the outcome of pending litigation will not have a material adverse effect on its financial position, results of operations, or cash flows. See Note 3 of the Notes to the Consolidated Financial Statements for details on certain investment commitments. Guaranty Fund Assessments The U.S. insurance industry has a policyholder protection system that is monitored and regulated by state insurance departments. These life and health insurance guaranty associations are state entities (in all 50 states as well as Puerto Rico and the District of Columbia) created to protect policyholders of an insolvent insurance company. All insurance companies (with limited exceptions) licensed to sell life or health insurance in a state must be members of that state’s guaranty association. Under state guaranty association laws, certain insurance companies can be assessed (up to prescribed limits) for certain obligations to the policyholders and claimants of impaired or insolvent insurance companies that write the same line or similar lines of business. In 2009, the Pennsylvania Insurance Commissioner placed long-term care insurer Penn Treaty Network America Insurance Company and its subsidiary American Network Insurance Company (collectively referred to as Penn Treaty), neither of which is affiliated with Aflac, in rehabilitation and petitioned a state court for approval to liquidate Penn Treaty. A final order of liquidation was granted by a recognized judicial authority on March 1, 2017, and as a result, Penn Treaty is in the process of liquidation. The Company estimated and recognized the impact of its share of guaranty fund assessments resulting from the liquidation using a discounted rate of 4.25%. The Company recognized a discounted liability for the assessments of $62 million (undiscounted $94 million), offset by discounted premium tax credits of $48 million (undiscounted $74 million), for a net $14 million impact to net income in the quarter ended March 31, 2017. The Company paid a majority of these assessments by September 30, 2021. The Company used the cost estimate provided as of the liquidation date by the National Organization of Life and Health Guaranty Associations (NOLHGA) to calculate its estimated assessments and tax credits. Guaranty fund assessments for the nine-month periods ended September 30, 2021 and 2020 were immaterial.