BUSINESS SEGMENT AND FOREIGN INFORMATION - Information on Transfers of Funds from Aflac Japan (Detail) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2013 JPY (¥)	Dec. 31, 2012 USD ($)	Dec. 31, 2012 JPY (¥)	Dec. 31, 2011 USD ($)	Dec. 31, 2011 JPY (¥)
Segment Reporting [Abstract]
Management fees	$ 37		$ 30		$ 28
Allocated expenses	74		58		43
Profit repatriation	771	76,800	422	33,100	143	11,000
Total transfers from Aflac Japan	$ 882		$ 510		$ 214