Changes in AOCI by component are as follows:



(in millions)	Unrealized Gain (Loss) on Available-for-Sale Securities				Cumulative Translation Adjustments (a)			Net Change in Retirement Obligations				Unrealized Gain (Loss) on Derivatives				Total Accumulated Other Comprehensive (Loss) Income
Balance as of April 24, 2015, net of tax	$	14			$	(277	)	$	(1,131	)		$	210			$	(1,184	)
Other comprehensive (loss) income before reclassifications, before tax	(399		)		(1,513		)	2				134				(1,776		)
Tax benefit (expense)	143				—			—				(50		)		93
Other comprehensive (loss) income before reclassifications, net of tax	(256		)		(1,513		)	2				84				(1,683		)
Reclassifications, before tax	(18		)		—			90				(232		)		(160		)
Tax benefit (expense)	6				—			(30		)		86				62
Reclassifications, net of tax	(12		)	(b)	—			60			(c)	(146		)	(d)	(98		)
Other comprehensive (loss) income, net of tax	(268		)		(1,513		)	62				(62		)		(1,781		)
Balance as of January 29, 2016, net of tax	$	(254	)		$	(1,790	)	$	(1,069	)		$	148			$	(2,965	)

(in millions)	Unrealized Gain (Loss) on Available-for-Sale Securities				Cumulative Translation Adjustments (a)			Net Change in Retirement Obligations				Unrealized Gain (Loss) on Derivatives				Total Accumulated Other Comprehensive (Loss) Income
Balance as of April 25, 2014, net of tax	$	(6	)		$	218		$	(765	)		$	(44	)		$	(597	)
Other comprehensive income (loss) before reclassifications, before tax	110				(332		)	24				397				199
Tax expense	(40		)		—			—				(141		)		(181		)
Other comprehensive income (loss) before reclassifications, net of tax	70				(332		)	24				256				18
Reclassifications, before tax	(134		)		—			57				(50		)		(127		)
Tax benefit (expense)	47				—			(18		)		16				45
Reclassifications, net of tax	(87		)	(b)	—			39			(c)	(34		)	(d)	(82		)
Other comprehensive (loss) income, net of tax	(17		)		(332		)	63				222				(64		)
Balance as of January 23, 2015, net of tax	$	(23	)		$	(114	)	$	(702	)		$	178			$	(661	)

(a) Taxes are not provided on cumulative translation adjustments as substantially all translation adjustments relate to earnings that are intended to be indefinitely reinvested outside the U.S.

(b) Represents net realized gains on sales of available-for-sale securities that were reclassified from AOCI to other expense, net (see Note 6).

(c) Includes net amortization of prior service costs and actuarial losses included in net periodic benefit cost (see Note 14).

(d) Relates to foreign currency cash flow hedges that were reclassified from AOCI to other expense, net or cost of products sold and forward starting interest rate derivative instruments that were reclassified from AOCI to interest expense, net (see Note 8).