Long-Term Obligations and Commitments - Senior Unsecured Notes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jan. 31, 2022	Jan. 31, 2022	Jul. 31, 2021
Debt Instrument [Line Items]
Total future principal payments for long-term debt		$ 6,750	$ 6,750
Long-term debt		6,732	6,732	$ 2,034
Senior Unsecured Notes \| The Senior Unsecured Notes Member
Debt Instrument [Line Items]
Proceeds from issuance	$ 1,980
Unamortized discount	2
Debt issuance costs	$ 15
Total future principal payments for long-term debt		2,000	2,000	2,000
Unamortized discount and debt issuance costs		(12)	(12)	(14)
Long-term debt		1,988	1,988	1,986
Redemption price (in percent)	101.00%
Interest paid		$ 12	$ 12
Senior Unsecured Notes \| 0.650% notes due July 2023
Debt Instrument [Line Items]
Stated interest rate (in percent)		0.65%	0.65%
Total future principal payments for long-term debt		$ 500	$ 500	500
Effective Interest Rate		0.837%	0.837%
Senior Unsecured Notes \| 0.950% notes due July 2025
Debt Instrument [Line Items]
Stated interest rate (in percent)		0.95%	0.95%
Total future principal payments for long-term debt		$ 500	$ 500	500
Effective Interest Rate		1.127%	1.127%
Senior Unsecured Notes \| 1.350% notes due July 2027
Debt Instrument [Line Items]
Stated interest rate (in percent)		1.35%	1.35%
Total future principal payments for long-term debt		$ 500	$ 500	500
Effective Interest Rate		1.486%	1.486%
Senior Unsecured Notes \| 1.650% notes due July 2030
Debt Instrument [Line Items]
Stated interest rate (in percent)		1.65%	1.65%
Total future principal payments for long-term debt		$ 500	$ 500	$ 500
Effective Interest Rate		1.767%	1.767%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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