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Stockholders' Equity - Additional Information (Details) - USD ($)	1 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2024	May 31, 2024	May 31, 2023	Aug. 31, 2023	Sep. 30, 2023	Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments for repurchase of common stock		$ 1,824,000,000	$ 442,000,000
2023 Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares repurchased		$ 1,800,000,000		$ 224,000,000
Stock repurchase program, authorized amount					$ 2,500,000,000	$ 1,000,000,000
2023 Share Repurchase Program \| Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares repurchased	$ 121,000,000
Accelerated Share Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount					$ 500,000,000
Accelerated Share Repurchase Program \| Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount	555,000,000
Payments for repurchase of common stock	$ 555,000,000
Time-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Restricted stock units awarded (in shares)		500,000	900,000
Performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Restricted stock units awarded (in shares)		100,000	200,000
Performance-based restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		150.00%
Market-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years
Restricted stock units awarded (in shares)		100,000	200,000
Market-based restricted stock units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage		200.00%
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available to be issued (in shares)		8,059,728