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		6 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Apr. 28, 2024	Apr. 30, 2023	Apr. 28, 2024	Apr. 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			$ 11,200		$ 11,200
Dividends declared per share (in dollars per share)	$ 0.40	$ 0.32	$ 0.40	$ 0.32	$ 0.72	$ 0.58
Payments of dividends					$ 532	$ 439
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	1.0	1.0
Employee Stock
Equity [Line Items]
Performance of total shareholder return					100.00%
Total unrecognized compensation expense			$ 1,100		$ 1,100
Weighted average period for unrecognized compensation expense to be recognized (in years)					2 years 9 months 18 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%