Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479838/944-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479616/944-310-45-5

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Name:	us-gaap_ReinsuranceRecoverables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

REINSURANCE - Additional Information (Details) $ in Millions, ¥ in Billions	1 Months Ended
	Jan. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2023 JPY (¥)	Dec. 31, 2022 USD ($)
Effects of Reinsurance [Line Items]
Deferred profit liability - reinsurance		$ 590		$ 692
Reinsurance recoverable		$ 895		$ 912
Aflac Life Insurance Japan (ALIJ) \| Aflac Re Bermuda
Effects of Reinsurance [Line Items]
Ceded reinsurance, percentage	28.00%
Ceded reinsurance, amount of reserves transferred	$ 2,100
Ceded reinsurance, amount of assets transferred	$ 1,900
Aflac Life Insurance Japan (ALIJ) \| Reinsurer, Other
Effects of Reinsurance [Line Items]
Ceded reinsurance, percentage	1.50%
Aflac Japan
Effects of Reinsurance [Line Items]
Committed reinsurance facility \| ¥			¥ 120