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Stockholders' Equity - Capital Stock and Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Nov. 08, 2018	Apr. 03, 2017
Equity [Abstract]
Initial authorization						$ 2,000
Additional authorization					$ 2,000
Number of shares repurchased (in shares)	2,112,212	1,750,000	0	3,862,212
Average price per share (in dollars per share)	$ 39.10	$ 38.52		$ 38.84
Amount	$ 83	$ 67		$ 150

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- Definition

Stock Repurchase Program, Increase (Decrease) Authorized Repurchase Amount

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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

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