BENEFIT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COSTS (Details) - USD ($) $ in Millions	4 Months Ended
	May 20, 2017	May 21, 2016
Pension Benefits
Components of net periodic benefit cost:
Service cost	$ 24	$ 21
Interest cost	56	58
Expected return on plan assets	(73)	(73)
Amortization of:
Actuarial (gain) loss	26	19
Curtailment	2
Net periodic benefit cost	35	25
Other Benefits
Components of net periodic benefit cost:
Service cost	3	3
Interest cost	3	3
Amortization of:
Prior service cost	(2)	(2)
Actuarial (gain) loss	(3)	(3)
Net periodic benefit cost	$ 1	$ 1