Benefit Plans (Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 04, 2018	Jul. 29, 2017	Aug. 04, 2018	Jul. 29, 2017
Total Retirement Expense	$ 15	$ 11	$ 29	$ 20
Settlement charges	50	51	50	51
Nonqualified Plan [Member]
Defined contribution plans expense	1	0	1	0
Qualified Plan [Member]
Defined contribution plans expense	24	24	47	45
Pension Plan [Member]
Service cost	1	2	3	3
Interest cost	27	27	53	54
Expected return on assets	(53)	(57)	(106)	(113)
Recognition of net actuarial (gain) loss	8	8	16	16
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(17)	(20)	(34)	(40)
Supplemental Employee Retirement Plan [Member]
Service cost	0	0	0	0
Interest cost	5	5	11	11
Recognition of net actuarial (gain) loss	2	2	4	4
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	7	7	15	15
Other Postretirement Benefits Plan [Member]
Service cost	0	0	0	0
Interest cost	1	2	2	3
Recognition of net actuarial (gain) loss	(1)	(1)	(2)	(2)
Amortization of prior service credit	0	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 0	$ 1	$ 0	$ 1