Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of cash received during the period on settlement of a hedge.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

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Description of the instruments designated as hedged items in hedges involving interest rate derivatives.

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Derivatives and Foreign Exchange Risk Management , Fair Value Hedges (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Apr. 24, 2015	Feb. 28, 2014	Apr. 24, 2015	Apr. 25, 2014	Feb. 28, 2015	Dec. 10, 2014	Mar. 31, 2013
Derivative [Line Items]
Derivative, Collateral, Obligation to Return Cash	$ 338		$ 338	$ 0
Senior Notes 2005 Due 2016 \| Senior notes
Derivative [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%		4.75%	4.75%
Fair Value Hedges
Principal amount	$ 600		$ 600	$ 600
Senior Notes 2011 Due 2016 \| Senior notes
Derivative [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.625%		2.625%	2.625%
Fair Value Hedges
Principal amount	$ 500		$ 500	$ 500
Senior Notes 2011 Due 2021 \| Senior notes
Derivative [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.125%		4.125%	4.125%
Fair Value Hedges
Principal amount	$ 500		$ 500	$ 500
Senior Notes 2012 Due 2022 \| Senior notes
Derivative [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.125%		3.125%	3.125%
Fair Value Hedges
Principal amount	$ 675		$ 675	$ 675
Senior Notes 2010 Due 2015 \| Senior notes
Derivative [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.00%		3.00%	3.00%
Fair Value Hedges
Principal amount	$ 1,250		$ 1,250	$ 1,250
Senior Notes 2005 Due 2016
Fair Value Hedges
Interest rate derivatives hedged items			$600 million 4.750 percent 2005 Senior Notes due 2016
Senior Notes 2010 Due 2015
Fair Value Hedges
Interest rate derivatives hedged items	$1.250 billion 3.000 percent 2010 Senior Notes
Senior Notes 2011 Due 2021
Fair Value Hedges
Interest rate derivatives hedged items			$500 million 4.125 percent 2011 Senior Notes due 2021
Senior Notes 2011 Due 2016
Fair Value Hedges
Interest rate derivatives hedged items			$500 million 2.625 percent 2011 Senior Notes due 2016
Senior Notes 2012 Due 2022
Fair Value Hedges
Interest rate derivatives hedged items			$675 million 3.125 percent 2012 Senior Notes due 2022
Interest rate swaps
Derivative [Line Items]
Derivative, Collateral, Obligation to Return Cash							$ 8
Fair Value Hedges
Cash receipts upon termination of hedge		$ 79
Cash Flow Hedging \| Designated as Hedging Instrument [Member] \| Interest rate swaps
Derivative [Line Items]
Derivative, Notional Amount	$ 800		$ 800		$ 250	$ 5,850
Fair Value Hedging [Member] \| Interest rate swaps
Fair Value Hedges
Unrealized gain on interest rate fair value hedging instruments			18	68
Unrealized loss on interest rate fair value hedged items			(18)	(68)
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest rate swaps
Derivative [Line Items]
Derivative, Notional Amount	$ 2,025		$ 2,025	$ 2,625