DEFERRED POLICY ACQUISITION COSTS AND INSURANCE EXPENSES - Lease and Rental Expense (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Lease and Rental Expense [Line Items]
Lease and rental expense	$ 66	$ 81	$ 82
Aflac Japan
Lease and Rental Expense [Line Items]
Lease and rental expense	55	71	73
Aflac U.S.
Lease and Rental Expense [Line Items]
Lease and rental expense	10	9	8
All Other
Lease and Rental Expense [Line Items]
Lease and rental expense	$ 1	$ 1	$ 1