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Fair Value Measurements (Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 30, 2016
Feb. 03, 2018
Jan. 28, 2017
Proceeds from Sale of Available-for-sale Securities, Equity $ 10    
Assets:      
Cash and Cash Equivalents   $ 1,515 $ 1,934
Investments, Fair Value Disclosure   17 5
Interest Rate Fair Value Hedge Asset at Fair Value     2
Foreign Currency Cash Flow Hedge Asset at Fair Value     18
Foreign Currency Cash Flow Hedge Liability at Fair Value   9 1
Fair Value, Inputs, Level 1      
Assets:      
Cash and Cash Equivalents   1,515 1,934
Investments, Fair Value Disclosure   17 5
Interest Rate Fair Value Hedge Asset at Fair Value     0
Foreign Currency Cash Flow Hedge Asset at Fair Value     0
Foreign Currency Cash Flow Hedge Liability at Fair Value   0 0
Fair Value, Inputs, Level 2      
Assets:      
Cash and Cash Equivalents   0 0
Investments, Fair Value Disclosure   0 0
Interest Rate Fair Value Hedge Asset at Fair Value     2
Foreign Currency Cash Flow Hedge Asset at Fair Value     18
Foreign Currency Cash Flow Hedge Liability at Fair Value   9 1
Fair Value, Inputs, Level 3      
Assets:      
Cash and Cash Equivalents   0 0
Investments, Fair Value Disclosure   0 0
Interest Rate Fair Value Hedge Asset at Fair Value     0
Foreign Currency Cash Flow Hedge Asset at Fair Value     0
Foreign Currency Cash Flow Hedge Liability at Fair Value   $ 0 $ 0