Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) shares in Thousands, $ in Millions	Total		Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (loss)
Beginning balance (in shares) at Mar. 31, 2022			280,051
Beginning balance at Mar. 31, 2022	$ 7,625		$ 3	$ 0	$ 7,607	$ 15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	367				311	56
Stock-based compensation	125			125
Issuance of common stock (in shares)			1,413
Issuance of common stock	(103)			(103)
Common stock repurchases (in shares)			(2,512)
Common stock repurchases	(320)			(22)	(298)
Cash dividends declared ($0.19 per common share)	(53)				(53)
Ending balance (in shares) at Jun. 30, 2022			278,952
Ending balance at Jun. 30, 2022	7,641		$ 3	0	7,567	71
Beginning balance (in shares) at Mar. 31, 2022			280,051
Beginning balance at Mar. 31, 2022	7,625		$ 3	0	7,607	15
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	$ 732
Common stock repurchases (in shares)	(5,100)
Common stock repurchases	$ (645)
Ending balance (in shares) at Sep. 30, 2022			277,024
Ending balance at Sep. 30, 2022	7,798		$ 3	0	7,658	137
Beginning balance (in shares) at Jun. 30, 2022			278,952
Beginning balance at Jun. 30, 2022	7,641		$ 3	0	7,567	71
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	365				299	66
Stock-based compensation	140			140
Issuance of common stock (in shares)			641
Issuance of common stock	$ 30			30
Common stock repurchases (in shares)	(2,600)		(2,569)
Common stock repurchases	$ (325)			(170)	(155)
Cash dividends declared ($0.19 per common share)	(53)				(53)
Ending balance (in shares) at Sep. 30, 2022			277,024
Ending balance at Sep. 30, 2022	$ 7,798		$ 3	0	7,658	137
Beginning balance (in shares) at Mar. 31, 2023	270,000		272,914
Beginning balance at Mar. 31, 2023	$ 7,293	[1]	$ 3	0	7,357	(67)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	394				402	(8)
Stock-based compensation	130			130
Issuance of common stock (in shares)			1,408
Issuance of common stock	(105)			(105)
Common stock repurchases (in shares)			(2,574)
Common stock repurchases and excise tax	(326)			(25)	(301)
Cash dividends declared ($0.19 per common share)	(52)				(52)
Ending balance (in shares) at Jun. 30, 2023			271,748
Ending balance at Jun. 30, 2023	$ 7,334		$ 3	0	7,406	(75)
Beginning balance (in shares) at Mar. 31, 2023	270,000		272,914
Beginning balance at Mar. 31, 2023	$ 7,293	[1]	$ 3	0	7,357	(67)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	$ 834
Common stock repurchases (in shares)	(5,200)
Common stock repurchases	$ (650)
Ending balance (in shares) at Sep. 30, 2023	270,000		269,840
Ending balance at Sep. 30, 2023	$ 7,575		$ 3	0	7,606	(34)
Beginning balance (in shares) at Jun. 30, 2023			271,748
Beginning balance at Jun. 30, 2023	7,334		$ 3	0	7,406	(75)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income	440				399	41
Stock-based compensation	155			155
Issuance of common stock (in shares)			673
Issuance of common stock	$ 25			25
Common stock repurchases (in shares)	(2,600)		(2,581)
Common stock repurchases and excise tax	$ (328)			(180)	(148)
Common stock repurchases	(325)
Cash dividends declared ($0.19 per common share)	$ (51)				(51)
Ending balance (in shares) at Sep. 30, 2023	270,000		269,840
Ending balance at Sep. 30, 2023	$ 7,575		$ 3	$ 0	$ 7,606	$ (34)

[1] Derived from audited Consolidated Financial Statements.