Earnings Per Share (Tables)

12 Months Ended

Mar. 31, 2019

Earnings Per Share Reconciliation [Abstract]

Computation Of Basic Earnings And Diluted Earnings Per Share

	Year Ended March 31,
(In millions, except per share amounts)	2019		2018		2017
Net income	$	1,019	$	1,043	$	967
Shares used to compute earnings per share:
Weighted-average common stock outstanding — basic	303		308		303
Dilutive potential common shares related to stock award plans and from assumed exercise of stock options	3		4		4
Dilutive potential common shares related to the Convertible Notes (a)	—		—		1
Dilutive potential common shares related to the Warrants (a)	—		—		6
Weighted-average common stock outstanding — diluted	306		312		314
Earnings per share:
Basic	$	3.36	$	3.39	$	3.19
Diluted	$	3.33	$	3.34	$	3.08