BENEFIT PLANS

Pension and Other Postretirement Plans

We have funded defined benefit plans in Japan and the United States, which cover substantially all of our full-time employees. Additionally, we maintain non-qualified, unfunded supplemental retirement plans that provide defined pension benefits in excess of limits imposed by federal tax law for certain Japanese, U.S. and former employees. Effective October 1, 2013, the U.S. tax-qualified defined benefit plan was frozen to new employees hired on or after October 1, 2013 and to employees rehired on or after October 1, 2013. U.S. employees who are not participants in the defined benefit plan receive a nonelective 401(k) employer contribution. Additionally, effective January 1, 2015, the U.S. non-qualified supplemental retirement plan was frozen to new participants.

We provide certain health care benefits for eligible U.S. retired employees, their beneficiaries and covered dependents ("other postretirement benefits"). The health care plan is contributory and unfunded. On October 1, 2013, a change was made to postretirement medical benefits to limit the eligibility for the benefits beginning January 1, 2014 to include the following: (1) active employees whose age plus service, in years, equals or exceeds 80 (rule of 80); (2) active employees who are age 55 or older and have met the 15 years of service requirement; (3) active employees who will meet the rule of 80 in the next five years; (4) active employees who are age 55 or older and who will meet the 15 years of service requirement within the next five years; and (5) current retirees. Effective October 1, 2013, this change was accounted for as a negative plan amendment and resulted in a reduction to the postretirement benefit obligation of approximately $51 million, with an offset to accumulated other comprehensive income (AOCI). Starting in the fourth quarter of 2013, this reduction is being amortized as a reduction to net periodic benefit cost over three years. The postretirement plan obligation was remeasured using a discount rate of 4.75% as of October 1, 2013. For certain employees and former employees, additional coverage is provided for all medical expenses for life.

Information with respect to our benefit plans' assets and obligations as of December 31 was as follows:



	Pension Benefits																Other
	Japan								U.S.								Postretirement Benefits
(In millions)	2015				2014				2015				2014				2015					2014
Projected benefit obligation:
Benefit obligation, beginning of year		$	267			$	270			$	717			$	601			$	44				$	46
Service cost		15				15				23				20				1					1
Interest cost		1				9				18				38				2					2
Actuarial (gain) loss		0				21				(6		)		74				(5		)			(3		)
Benefits and expenses paid		(7		)		(9		)		(17		)		(16		)		(2		)			(2		)
Effect of foreign exchange rate changes		0				(39		)		0				0				0					0
Benefit obligation, end of year		276				267				735				717				40					44

Plan assets:
Fair value of plan assets, beginning of year		183				182				341				313				0					0
Actual return on plan assets		1				12				(6		)		26				0					0
Employer contributions		21				24				18				18				2					2
Benefits and expenses paid		(7		)		(9		)		(17		)		(16		)		(2		)			(2		)
Effect of foreign exchange rate changes		0				(26		)		0				0				0					0
Fair value of plan assets, end of year		198				183				336				341				0					0
Funded status of the plans⁽¹⁾		$	(78	)		$	(84	)		$	(399	)		$	(376	)		$	(40	)			$	(44	)

Amounts recognized in accumulated other comprehensive income:
Net actuarial (gain) loss		$	42			$	40			$	175			$	167			$	12				$	19
Prior service (credit) cost		(2		)		(2		)		(4		)		(4		)		(11		)			(28		)
Total included in accumulated other comprehensive income		$	40			$	38			$	171			$	163			$	1				$	(9	)
Accumulated benefit obligation		$	244			$	235			$	621			$	611			N/A			⁽²⁾		N/A			⁽²⁾

⁽¹⁾ Recognized in other liabilities in the consolidated balance sheets

⁽²⁾Not applicable



	Pension Benefits																		Other
	Japan									U.S.									Postretirement Benefits
	2015			2014			2013			2015			2014			2013			2015			2014			2013
Weighted-average actuarial assumptions:
Discount rate - net periodic benefit cost	1.75	%		2.25	%		2.25	%		4.50	%		4.75	%		4.25	%		4.50	%		4.75	%		4.25	%
Discount rate - benefit obligations	1.75			1.75			2.25			4.50			4.50			4.75			4.50			4.50			4.75
Expected long-term return on plan assets	2.00			2.00			2.00			7.25			7.50			7.50			N/A		⁽¹⁾	N/A		⁽¹⁾	N/A		⁽¹⁾
Rate of compensation increase	N/A		⁽¹⁾	N/A		⁽¹⁾	N/A		⁽¹⁾	4.00			4.00			4.00			N/A		⁽¹⁾	N/A		⁽¹⁾	N/A		⁽¹⁾
Health care cost trend rates	N/A		⁽¹⁾	N/A		⁽¹⁾	N/A		⁽¹⁾	N/A		⁽¹⁾	N/A		⁽¹⁾	N/A		⁽¹⁾	5.30		⁽²⁾	5.70		⁽²⁾	6.40		⁽²⁾

⁽¹⁾ Not applicable

⁽²⁾For the years 2015, 2014 and 2013, the health care cost trend rates are expected to trend down to 4.5% in 78 years, 4.6% in 78 years, and 4.6% in 78 years, respectively.

We determine our discount rate assumption for our pension retirement obligations based on indices for AA corporate bonds with an average duration of approximately 20 years for the Japan pension plans and 17 years for the U.S. pension plans, and determination of the U.S. pension plans discount rate utilizes the 85-year extrapolated yield curve. In Japan, participant salary and future salary increases are not factors in determining pension benefit cost or the related pension benefit obligation.

We base our assumption for the long-term rate of return on assets on historical trends (10-year or longer historical rates of return for the Japanese plan assets and 15-year historical rates of return for the U.S. plan assets), expected future market movement, as well as the portfolio mix of securities in the asset portfolio including, but not limited to, style, class and equity and fixed income allocations. In addition, our consulting actuaries evaluate our assumptions for long-term rates of return under Actuarial Standards of Practice (ASOP). Under the ASOP, the actual portfolio type, mix and class is modeled to determine a best estimate of the long-term rate of return. We in turn use those results to further validate our own assumptions.

Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plan. A one-percentage point increase and decrease in assumed health care cost trend rates would have the following effects as of December 31, 2015:



(In millions)
One percentage point increase:
Increase in total service and interest costs	$	0
Increase in postretirement benefit obligation	2

One percentage point decrease:
Decrease in total service and interest costs	$	0
Decrease in postretirement benefit obligation	2

Components of Net Periodic Benefit Cost

Pension and other postretirement benefit expenses, included in acquisition and operating expenses in the consolidated statements of earnings for the years ended December 31, included the following components:



	Pension Benefits																								Other
		Japan											U.S.												Postretirement Benefits
(In millions)	2015				2014				2013				2015				2014				2013				2015				2014				2013
Service cost		$	15			$	15			$	16			$	23			$	20			$	22			$	1			$	1			$	5
Interest cost		1				9				10				18				38				23				2				2				3
Expected return on plan assets		(4		)		(4		)		(3		)		(22		)		(20		)		(17		)		0				0				0
Amortization of net actuarial loss		1				1				2				14				11				15				2				3				2
Amortization of prior service cost (credit)		0				0				0				0				0				0				(17		)		(17		)		(4		)
Net periodic (benefit) cost		$	13			$	21			$	25			$	33			$	49			$	43			$	(12	)		$	(11	)		$	6

Changes in Accumulated Other Comprehensive Income

The following table summarizes the amounts recognized in other comprehensive loss (income) for the years ended December 31:



	Pension Benefits																								Other
	Japan												U.S.												Postretirement Benefits
(In millions)	2015				2014				2013				2015				2014				2013				2015				2014				2013
Net actuarial loss (gain)		$	3			$	12			$	(14	)		$	22			$	67			$	(59	)		$	(5	)		$	(3	)		$	(7	)
Amortization of net actuarial loss		(1		)		(1		)		(2		)		(14		)		(11		)		(15		)		(2		)		(3		)		(2		)
Prior service cost (credit)		0				0				0				0				0				(4		)		0				0				(51		)
Amortization of prior service cost		0				0				0				0				0				0				17				17				4
Total		$	2			$	11			$	(16	)		$	8			$	56			$	(78	)		$	10			$	11			$	(56	)

Prior service credits of $51 million were incurred in 2013 for the plan amendment related to the change in eligibility for postretirement medical benefits mentioned above. No transition obligations arose during 2015, and the transition obligations amortized to expense were immaterial for the years ended December 31, 2015, 2014 and 2013. Amortization of actuarial losses to expense in 2016 is estimated to be $1 million for the Japanese plans, $13 million for the U.S. plans and $1 million for the other postretirement benefits plan. Amortization of prior service credits in 2016 is estimated to be $10 million for the other postretirement benefits plan due to the negative plan amendment in 2013. The amortization of prior service costs and credits for other plans and transition obligations for all plans is expected to be negligible in 2016.

Benefit Payments

The following table provides expected benefit payments, which reflect expected future service, as appropriate.



	Pension Benefits						Other
(In millions)	Japan			U.S.			Postretirement Benefits
2016		$	12		$	21		$	2
2017		7			22			3
2018		7			23			3
2019		9			24			3
2020		10			25			4
2021-2025		66			170			19

Funding

We plan to make contributions of $20 million to the Japanese funded defined benefit plan and $10 million to the U.S. funded defined benefit plan in 2016. The funding policy for our non-qualified supplemental defined benefit pension plans and other postretirement benefits plan is to contribute the amount of the benefit payments made during the year.

Plan Assets

The investment objective of our Japanese and U.S. funded defined benefit plans is to preserve the purchasing power of the plan's assets and earn a reasonable inflation-adjusted rate of return over the long term. Furthermore, we seek to accomplish these objectives in a manner that allows for the adequate funding of plan benefits and expenses. In order to achieve these objectives, our goal is to maintain a conservative, well-diversified and balanced portfolio of high-quality equity, fixed-income and money market securities. As a part of our strategy, we have established strict policies covering quality, type and concentration of investment securities. For our Japanese plan, these policies include limitations on investments in derivatives including futures, options and swaps, and low-liquidity investments such as real estate, venture capital investments, and privately issued securities. For our U.S. plan, these policies prohibit investments in precious metals, limited partnerships, venture capital, and direct investments in real estate. We are also prohibited from trading on margin.

The plan fiduciaries for our funded defined benefit plans have developed guidelines for asset allocations reflecting a percentage of total assets by asset class, which are reviewed on an annual basis. Asset allocation targets as of December 31, 2015 were as follows:



	Japan Pension			U.S. Pension
Domestic equities		11	%		43	%
International equities		15			22
Fixed income securities		59			35
Other		15			0
Total		100	%		100	%

The following table presents the fair value of Aflac Japan's pension plan assets that are measured at fair value on a recurring basis as of December 31. All of these assets are classified as Level 2 in the fair value hierarchy, except cash and cash equivalents which are classified as Level 1.



(In millions)	2015			2014
Japan pension plan assets:
Equities:
Japanese equity securities		$	22		$	0
International equity securities		33			34
Fixed income securities:
Japanese bonds		71			72
International bonds		48			44
Insurance contracts		23			22
Cash and cash equivalents		1			11
Total		$	198		$	183

The following table presents the fair value of Aflac U.S.'s pension plan assets that are measured at fair value on a recurring basis as of December 31. All of these assets are classified as Level 1 in the fair value hierarchy.



(In millions)	2015			2014
U.S. pension plan assets:
Mutual funds:
Large cap equity funds		$	94		$	116
Mid cap equity funds		16			14
Real estate equity funds		10			10
International equity funds		77			61
Fixed income bond funds		134			136
Aflac Incorporated common stock		4			4
Cash and cash equivalents		1			0
Total		$	336		$	341

The fair values of our pension plan investments categorized as Level 1, consisting of mutual funds and common stock, are based on quoted market prices for identical securities traded in active markets that are readily and regularly available to us. The fair values of our pension plan investments classified as Level 2 are based on quoted prices for similar assets in markets that are not active, other inputs that are observable, such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks, and default rates, or other market-corroborated inputs.

401(k) Plan

The Company sponsors a 401(k) plan in which we match a portion of U.S. employees' contributions. The plan provides for salary reduction contributions by employees and, in 2015, 2014, and 2013, provided matching contributions by the Company of 50% of each employee's contributions which were not in excess of 6% of the employee's annual cash compensation.

On January 1, 2014, the Company began providing a nonelective contribution to the 401(k) plan of 2% of annual cash compensation for employees who elected to opt out of the future benefits of the U.S. defined benefit plan during the election period provided during the fourth quarter of 2013 and for new U.S. employees who started working for the Company after September 30, 2013.

The 401(k) contributions by the Company, included in acquisition and operating expenses in the consolidated statements of earnings, were $9 million in 2015, $7 million in 2014 and $5 million in 2013. The plan trustee held approximately one million shares of our common stock for plan participants at December 31, 2015.

Stock Bonus Plan

Aflac U.S. maintains a stock bonus plan for eligible U.S. sales associates. Plan participants receive shares of Aflac Incorporated common stock based on their new annualized premium sales and their first-year persistency of substantially all new insurance policies. The cost of this plan, which was capitalized as deferred policy acquisition costs, amounted to $34 million in 2015, compared with $36 million in 2014 and $38 million in 2013.