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Stock Incentive Plans - Schedule of Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Total share-based compensation cost	$ 26	$ 20	$ 51	$ 36
Related income tax benefit	4	3	7	5
Total intrinsic value of options exercised	1	0	6	0
Tax benefits from exercised stock options and awards	$ 4	$ 1	$ 15	$ 4

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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