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Borrowings - Additional Information (Details)	Aug. 20, 2021 USD ($)	May 13, 2021 USD ($) extension_option	May 15, 2020	Jul. 31, 2021 USD ($)	Jul. 25, 2020 USD ($)
Debt Instrument [Line Items]
Derivative notional amount				$ 6,869,000,000	$ 7,395,000,000
Fixed Rate Notes, 1.85% Due September 20, 2021
Debt Instrument [Line Items]
Interest rate				1.90%	1.90%
Fixed Rate Notes, 1.85% Due September 20, 2021 | Subsequent event
Debt Instrument [Line Items]
Face amount	$ 2,000,000,000
Redemption price percentage	100.00%
Unsecured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility term		5 years	364 days
Maximum borrowing capacity		$ 3,000,000,000
Line of credit outstanding				$ 0
Additional credit facility upon agreement (up to)		$ 2,000,000,000
Number of extension options | extension_option		2
Unsecured Debt | Revolving Credit Facility | Pounds Sterling | Minimum
Debt Instrument [Line Items]
Interest rate		0.00%
Unsecured Debt | Revolving Credit Facility | Federal Funds Rate | U.S. dollars
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
Unsecured Debt | Revolving Credit Facility | LIBOR | U.S. dollars
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Interest rate derivatives
Debt Instrument [Line Items]
Derivative notional amount				2,000,000,000	$ 2,500,000,000
Derivatives designated as hedging instruments | Interest rate derivatives | Fair value hedges
Debt Instrument [Line Items]
Derivative notional amount				2,000,000,000
Commercial paper
Debt Instrument [Line Items]
Face amount				10,000,000,000
Short-term debt outstanding				$ 0	$ 0

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Nominal or face amount used to calculate payment on derivative.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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