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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(6))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489

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 ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 JPY (¥)	Dec. 31, 2022 USD ($)
Aflac Life Insurance Japan (ALIJ) \| Aflac Re Bermuda
Effects of Reinsurance [Line Items]
Ceded insurance, 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 insurance, percentage	1.50%
Aflac Japan
Effects of Reinsurance [Line Items]
Committed reinsurance facility \| ¥			¥ 120
Aflac Japan \| Closed Block
Effects of Reinsurance [Line Items]
Reinsurance deferred profit liability		$ 682		$ 692
Reinsurance recoverable		$ 1,100		$ 912