Benefit Plans (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended
	May 05, 2018	Apr. 29, 2017
Total Retirement Expense	$ 14	$ 9
Nonqualified Plan [Member]
Defined contribution plans expense	0	0
Qualified Plan [Member]
Defined contribution plans expense	23	21
Pension Plan [Member]
Service cost	2	1
Interest cost	26	27
Expected return on assets	(53)	(56)
Recognition of net actuarial (gain) loss	8	8
Amortization of prior service credit	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(17)	(20)
Supplemental Employee Retirement Plan [Member]
Service cost	0	0
Interest cost	6	6
Recognition of net actuarial (gain) loss	2	2
Amortization of prior service credit	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	8	8
Other Postretirement Benefits Plan [Member]
Service cost	0	0
Interest cost	1	1
Recognition of net actuarial (gain) loss	(1)	(1)
Amortization of prior service credit	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 0	$ 0