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Share-Based Compensation - Schedule of Restricted Stock Unit Award Activity (Details) - Restricted stock units
shares in Millions
12 Months Ended
Mar. 31, 2017
$ / shares
shares
Shares  
Beginning balance (in shares) | shares 3
Granted (in shares) | shares 1
Cancelled (in shares) | shares (1)
Vested (in shares) | shares (1)
Ending balance (in shares) | shares 2
Weighted- Average Grant Date Fair Value Per Share  
Beginning balance (in dollars per shares) | $ / shares $ 176.59
Granted (in dollars per share) | $ / shares 182.37
Cancelled (in dollars per share) | $ / shares 190.41
Vested (in dollars per share) | $ / shares 119.96
Ending balance (in dollars per shares) | $ / shares $ 188.54