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Summary of Significant Accounting Policies (Estimated Future Amortization Expense) (Details) - HD Holdings Inc
$ in Millions
Jan. 31, 2021
USD ($)
Business Acquisition [Line Items]  
Fiscal 2021 $ 176
Fiscal 2022 176
Fiscal 2023 174
Fiscal 2024 174
Fiscal 2025 174
Thereafter 2,089
Total $ 2,963