Postretirement Health Care and Life Insurance Benefits (Net Periodic Benefit Cost) (Details) - Other Postretirement Benefits Plan [Member] - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Service cost	$ 0	$ 0	$ 0
Interest cost	5	6	8
Amortization of net actuarial (gain) loss	(5)	(4)	0
Amortization of prior service credit	0	0	0
Total net periodic benefit cost	0	2	8
Net actuarial (gain) loss recognized in OCI before tax	(9)	(13)	(22)
Amortization of net actuarial loss	5	4	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	(10)	0	0
Total recognized in other comprehensive income	(14)	(9)	(22)
Total recognized in net periodic benefit cost and other comprehensive income	$ (14)	$ (7)	$ (14)