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Stockholders' Equity - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 29, 2016 USD ($)	Jul. 31, 2015 $ / shares	Mar. 31, 2016 USD ($) vote $ / shares shares	Mar. 31, 2016 USD ($) vote $ / shares shares	Mar. 31, 2015 USD ($) $ / shares shares	Mar. 31, 2014 USD ($) $ / shares shares	Mar. 31, 2013 USD ($)
Dividends Payable [Line Items]
Number of votes | vote			1	1
Cash dividends declared per common share (in dollars per share) | $ / shares				$ 1.08	$ 0.96	$ 0.92
Shares bought | shares				8.7	1.5	0.0
Shares repurchased				$ 1,504	$ 340	$ 0
Average price paid per share (in dollars per share) | $ / shares				$ 173.64	$ 226.55	$ 0.00
Total authorization outstanding for repurchases of common stock			$ 996	$ 996	$ 0	$ 340	$ 340
Treasury stock retired (in shares) | shares				115.5
Retirement of common stock				$ 0
Net foreign currency translation gains (losses)				$ 172	(1,989)	83
Treasury Stock
Dividends Payable [Line Items]
Treasury stock retired (in shares) | shares				116.0
Retirement of common stock				$ 7,848
Retained Earnings
Dividends Payable [Line Items]
Retirement of common stock				6,354
Additional Paid-in Capital
Dividends Payable [Line Items]
Retirement of common stock				1,493
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
Dividends Payable [Line Items]
Net foreign currency translation gains (losses)				113	(1,855)	53
Other comprehensive income (loss) before reclassifications				113	(1,845)	$ 9
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest
Dividends Payable [Line Items]
Net foreign currency translation gains (losses)				16	(267)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest
Dividends Payable [Line Items]
Other comprehensive income (loss) before reclassifications				$ 4	$ (12)
Open Market Transactions
Dividends Payable [Line Items]
Shares bought | shares				4.5
Shares repurchased				$ 854
Average price paid per share (in dollars per share) | $ / shares				$ 192.27
Accelerated Share Repurchase
Dividends Payable [Line Items]
Shares bought | shares			4.2
Shares repurchased	$ 650
Average price paid per share (in dollars per share) | $ / shares			$ 154.04
Minimum
Dividends Payable [Line Items]
Cash dividends declared per common share (in dollars per share) | $ / shares		$ 0.24
Maximum
Dividends Payable [Line Items]
Cash dividends declared per common share (in dollars per share) | $ / shares		$ 0.28

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