Stock-Based Compensation Schedule of Share Repurchases (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended				6 Months Ended
	Nov. 04, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Nov. 04, 2020	May 11, 2018
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value		$ 325	$ 325	$ 0	$ 78
May 2018 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value							$ 78
Stock Repurchased and Retired During Period, Shares							0.7
Stock Repurchase Program, Authorized Amount									$ 2,400
November 2020 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value		$ 325				$ 650
Stock Repurchased and Retired During Period, Shares		2.3				4.6
Stock Repurchase Program, Authorized Amount								$ 2,600
Stock Repurchase Program Expiration Date	Nov. 04, 2022
Repurchase Program, Total
Equity, Class of Treasury Stock [Line Items]
Stock Repurchased and Retired During Period, Value		$ 325				$ 650	$ 78
Stock Repurchased and Retired During Period, Shares		2.3				4.6	0.7