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Stockholders' Equity - Schedule of Share Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	May 31, 2018	Oct. 31, 2016
Stockholders' Equity Note [Abstract]
Total Number of Shares Purchased (in shares)		13.5	10.5	15.5
Average price paid per share (in dollars per share)	$ 143.66	$ 130.72	$ 151.06	$ 141.16
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs
Beginning balance	$ 1,096,000,000	$ 1,096,000,000	$ 2,746,000,000	$ 996,000,000
Additional authorized					$ 4,000,000,000	$ 4,000,000,000.0
Shares repurchased		(1,627,000,000)	(1,650,000,000)	(2,250,000,000)
Ending balance		$ 3,469,000,000	$ 1,096,000,000	$ 2,746,000,000

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Share Repurchases, Approximate Dollar Value of Shares that May Yet Be Purchased Under the Programs [Roll Forward]

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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