Stockholders' Equity, Comprehensive Income and Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended			3 Months Ended		9 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jul. 28, 2024	Jul. 30, 2023	Jul. 28, 2024	Jul. 30, 2023	Mar. 31, 2023	Mar. 31, 2022
Equity [Line Items]
Amount authorized by board of directors to repurchase shares								$ 10,000	$ 6,000
Remaining authorized repurchase amount				$ 10,300		$ 10,300
Dividends declared per share (in dollars per share)	$ 0.40	$ 0.40	$ 0.32	$ 0.40	$ 0.32	$ 1.12	$ 0.90
Payments of dividends						$ 863	$ 707
Employee Stock Incentive Plan
Equity [Line Items]
Number of shares available for grant (in shares)				21.0		21.0
Employee Stock Purchase Plan
Equity [Line Items]
Number of shares available for grant (in shares)				11.0		11.0
Employee stock purchase plan purchase period						6 months
Shares issued under employee stock purchase plans (in shares)						1.0	1.0
Employee Stock
Equity [Line Items]
Performance of total shareholder return						100.00%
Total unrecognized compensation expense				$ 977		$ 977
Weighted average period for unrecognized compensation expense to be recognized						2 years 8 months 12 days
Employee Stock | Employee Stock Purchase Plan
Equity [Line Items]
Purchase price of common stock						85.00%
Performance Shares
Equity [Line Items]
Additional performance-based awards to be earned upon certain levels of achievement (in shares)				0.7		0.7
Award measurement metric relative weight						50.00%
Award measurement period						3 years
Performance Shares | Minimum
Equity [Line Items]
Award vesting rights, percentage of target amount						0.00%
Performance Shares | Maximum
Equity [Line Items]
Award vesting rights, percentage of target amount						200.00%