CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury	Noncontrolling Interests
Beginning balance (in shares) at Mar. 31, 2023		277
Beginning balance at Mar. 31, 2023	$ (1,490)	$ 3	$ 7,747	$ 12,295	$ (905)	$ (20,997)	$ 367
Beginning balance (in shares) at Mar. 31, 2023						(141)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under employee plans, net of forfeitures (in shares)		1
Issuance of shares under employee plans, net of forfeitures	(40)		54			$ (94)
Share-based compensation	91		91
Repurchase of common stock (in shares)						(4)
Repurchase of common stock	(1,513)					$ (1,513)
Net income	1,700			1,622			78
Other comprehensive income (loss)	18				18
Cash dividends declared	(157)			(157)
Payments to noncontrolling interests	(77)						(77)
Other	4		7	1			(4)
Ending balance (in shares) at Sep. 30, 2023		278
Ending balance at Sep. 30, 2023	(1,464)	$ 3	7,899	13,761	(887)	$ (22,604)	364
Ending balance (in shares) at Sep. 30, 2023						(145)
Beginning balance (in shares) at Jun. 30, 2023		278
Beginning balance at Jun. 30, 2023	(1,240)	$ 3	7,824	13,182	(848)	$ (21,763)	362
Beginning balance (in shares) at Jun. 30, 2023						(143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under employee plans, net of forfeitures	26		27			$ (1)
Share-based compensation	48		48
Repurchase of common stock (in shares)						(2)
Repurchase of common stock	(840)					$ (840)
Net income	703			664			39
Other comprehensive income (loss)	(39)				(39)
Cash dividends declared	(84)			(84)
Payments to noncontrolling interests	(38)						(38)
Other	0			(1)			1
Ending balance (in shares) at Sep. 30, 2023		278
Ending balance at Sep. 30, 2023	$ (1,464)	$ 3	7,899	13,761	(887)	$ (22,604)	364
Ending balance (in shares) at Sep. 30, 2023						(145)
Beginning balance (in shares) at Mar. 31, 2024	278	278
Beginning balance at Mar. 31, 2024	$ (1,599)	$ 3	8,048	14,978	(881)	$ (24,119)	372
Beginning balance (in shares) at Mar. 31, 2024	(148)					(148)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under employee plans, net of forfeitures (in shares)		1
Issuance of shares under employee plans, net of forfeitures	$ (80)		54			$ (134)
Share-based compensation	119		119
Repurchase of common stock (in shares)						(4)
Repurchase of common stock	(2,057)					$ (2,057)
Net income	1,247			1,156			91
Other comprehensive income (loss)	(9)				(9)
Cash dividends declared	(173)			(173)
Payments to noncontrolling interests	(88)						(88)
Other	$ (2)			(2)
Ending balance (in shares) at Sep. 30, 2024	279	279
Ending balance at Sep. 30, 2024	$ (2,642)	$ 3	8,221	15,959	(890)	$ (26,310)	375
Ending balance (in shares) at Sep. 30, 2024	(152)					(152)
Beginning balance (in shares) at Jun. 30, 2024		279
Beginning balance at Jun. 30, 2024	$ (1,381)	$ 3	8,126	15,810	(913)	$ (24,781)	374
Beginning balance (in shares) at Jun. 30, 2024						(149)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under employee plans, net of forfeitures	32		32
Share-based compensation	63		63
Repurchase of common stock (in shares)						(3)
Repurchase of common stock	(1,529)					$ (1,529)
Net income	287			241			46
Other comprehensive income (loss)	23				23
Cash dividends declared	(90)			(90)
Payments to noncontrolling interests	(45)						(45)
Other	$ (2)			(2)
Ending balance (in shares) at Sep. 30, 2024	279	279
Ending balance at Sep. 30, 2024	$ (2,642)	$ 3	$ 8,221	$ 15,959	$ (890)	$ (26,310)	$ 375
Ending balance (in shares) at Sep. 30, 2024	(152)					(152)