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Fair Value Measurements (Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis) (Details) - USD ($)
$ in Millions
Jan. 31, 2021
Feb. 02, 2020
Fair Value, Assets and Liabilities Measured on Non-Recurring Basis[Line Items]    
Carrying value of senior notes $ 34,472 $ 29,344
Fair Value, Nonrecurring | Fair Value (Level 1) | Senior Loans    
Fair Value, Assets and Liabilities Measured on Non-Recurring Basis[Line Items]    
Fair value of senior notes $ 41,289 $ 34,102