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Revenue - Schedule of Internal Risk Ratings for Contract Assets (Details) $ in Millions | Jul. 31, 2021 USD ($)
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Financing Receivable, Credit Quality Indicator [Line Items] |
Gross contract assets | $ 1,457
1 to 4 |
Financing Receivable, Credit Quality Indicator [Line Items] |
Gross contract assets | 521
5 to 6 |
Financing Receivable, Credit Quality Indicator [Line Items] |
Gross contract assets | 770
7 and Higher |
Financing Receivable, Credit Quality Indicator [Line Items] |
Gross contract assets | $ 166

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