BUSINESS SEGMENT AND FOREIGN INFORMATION - Information on Transfers of Funds from Aflac Japan (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting [Abstract]
Management fees	$ 79	$ 53	$ 39
Allocated expenses	106	101	71
Profit repatriation	1,286	2,139	1,704
Total transfers from Aflac Japan	$ 1,471	$ 2,293	$ 1,814