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Pension and Other Benefits - Schedule of Net Pension and Postretirement Health Care Benefits Expense (Details) - Pension Plan - USD ($)
$ in Millions
3 Months Ended
Apr. 30, 2016
May. 02, 2015
Net Pension Benefits Expense    
Service cost $ 21 $ 28
Interest cost 34 38
Expected return on assets (64) (65)
Amortization of losses 12 23
Amortization of prior service cost (3) (3)
Settlement charges 0 2
Total $ 0 $ 23