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Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
Fair Value Measurements - Narrative (Details) - USD ($)	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024	Jul. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	$ 6,260,000,000		$ 6,260,000,000		$ 6,038,000,000
Long-term investments	88,000,000		88,000,000		131,000,000
Cash equivalents:	2,435,000,000		2,435,000,000		3,609,000,000
Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	1,193,000,000		1,193,000,000		2,538,000,000
Fair value, measurements, recurring \| Funds receivable and amounts held for customers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	22,000,000		22,000,000		0
Senior unsecured notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	5,500,000,000		5,500,000,000		5,500,000,000
Level 2 \| Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0		0		0
Level 2 \| Fair value, measurements, recurring \| Funds receivable and amounts held for customers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	0		0		0
Level 2 \| Senior unsecured notes \| Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior unsecured notes	5,400,000,000		5,400,000,000		5,500,000,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Upward adjustments to non-marketable equity securities	8,000,000	$ 4,000,000	8,000,000	$ 4,000,000
Downward adjustments to non-marketable equity securities	9,000,000	$ 0	51,000,000	$ 0
Cumulative upward adjustments to non-marketable equity securities	82,000,000		82,000,000
Cumulative downward adjustments to non-marketable equity securities	69,000,000		69,000,000
Level 1 \| Fair value, measurements, recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	1,193,000,000		1,193,000,000		2,538,000,000
Level 1 \| Fair value, measurements, recurring \| Funds receivable and amounts held for customers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents:	$ 22,000,000		$ 22,000,000		$ 0