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Basis of Presentation - Narrative (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Nov. 01, 2019
Retained Earnings Adjustments [Line Items]    
Total lease liabilities $ 1,175  
Other non-current assets $ 1,112  
ASU 2016-02    
Retained Earnings Adjustments [Line Items]    
Total lease liabilities   $ 1,200
Other non-current assets   $ 1,200