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BUSINESS SEGMENT INFORMATION - Operations by Segment - Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 122,306	$ 117,566
Aflac Japan
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	94,131	90,210
Aflac U.S.
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	22,569	21,930
Corporate and other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 5,606	$ 5,426

X

- Definition

Amount of asset recognized for present right to economic benefit.

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