Share-Based Compensation - Schedule of Restricted Stock Unit Award Activity (Details) - Restricted stock units shares in Millions	12 Months Ended
	Mar. 31, 2016 $ / shares shares
Shares
Beginning balance (in shares) | shares	4
Granted (in shares) | shares	1
Cancelled (in shares) | shares	(1)
Vested (in shares) | shares	(1)
Ending balance (in shares) | shares	3
Weighted- Average Grant Date Fair Value Per Share
Beginning balance (in dollars per shares) | $ / shares	$ 129.57
Granted (in dollars per share) | $ / shares	240.35
Cancelled (in dollars per share) | $ / shares	159.17
Vested (in dollars per share) | $ / shares	89.44
Ending balance (in dollars per shares) | $ / shares	$ 176.59