TREASURY STOCK

Changes in treasury stock for the nine months ended September 30, 2017 and 2016 were as follows:



	2017					2016
(millions, except share data)	Treasury Shares (000)		Treasury Stock			Treasury Shares (000)		Treasury Stock
Balance as of January 1	—		$	—		—		$	—
Repurchase of common stock for tax withholdings related to stock-based compensation	(115	)	(4		)	(84	)	(2		)
Repurchase of common stock under share repurchase program	(5,150	)	(153		)	—		—
Stock reissuances	227		7			84		2
Balance as of September 30	(5,038	)	$	(150	)	—		$	—

ACCUMULATED OTHER COMPREHENSIVE LOSS

Changes in the balances of each component of AOCI for the nine months ended September 30, 2017 and 2016 were as follows:



	Derivatives						Defined Benefit Plans						Foreign Currency Translation						AOCI
(millions)	2017			2016			2017			2016			2017			2016			2017			2016
Balance as of January 1	$	27		$	20		$	(246	)	$	(221	)	$	(166	)	$	(113	)	$	(385	)	$	(314	)
Other comprehensive income (loss) before reclassifications, net of tax	(11		)	(6		)	(12		)	(9		)	58			(9		)	35			(24		)
Less: Amounts reclassified from AOCI, net of tax	(1		)	(6		)	(13		)	(1		)	—			—			(14		)	(7		)
Net other comprehensive income (loss)	(10		)	—			1			(8		)	58			(9		)	49			(17		)
Balance as of September 30	$	17		$	20		$	(245	)	$	(229	)	$	(108	)	$	(122	)	$	(336	)	$	(331	)

Amounts reclassified from AOCI, net of tax, for the three and nine months ended September 30, 2017 and 2016, were as follows:



	Three months ended September 30,						Nine months ended September 30,
(millions)	2017			2016			2017			2016
Derivatives
Net reclassification from AOCI for cash flow hedges included in cost of products sold	$	(1	)	$	(3	)	$	(2	)	$	(9	)
Less: Income tax benefit on reclassification from AOCI included in income tax expense	(1		)	(1		)	(1		)	(3		)
Net amount reclassified from AOCI	$	—		$	(2	)	$	(1	)	$	(6	)

Defined Benefit Plans
Net reclassification from AOCI for amortization of prior service cost included in cost of products sold	$	(3	)	$	(2	)	$	(7	)	$	(5	)
Net reclassification from AOCI for amortization of prior service cost included in selling and administrative expenses	—			1			(3		)	2
Net reclassification from AOCI for amortization of prior service cost included in (loss) income from discontinued operations, net of tax	—			—			(8		)	—
Less: Income tax benefit on reclassification from AOCI included in income tax expense	(2		)	(1		)	(5		)	(2		)
Net amount reclassified from AOCI	$	(1	)	$	—		$	(13	)	$	(1	)

We estimate that we will reclassify a net $5 million after-tax loss on derivatives from AOCI to earnings within the next 12 months.