CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Net income/(loss) $ (128) $ (67) $ (370) $ (191)
Other comprehensive income/(loss), net of tax:        
Net actuarial gain/(loss) arising during the period (1) 31 0 36 0
Prior service credit/(cost) arising during the period (2) 0 0 0 5
Reclassification for net actuarial (gain)/loss (3) 0 (3) 0 (5)
Reclassification for amortization of prior service (credit)/cost (4) 1 0 3 0
Net curtailment gain (5) 0 0 20 0
Net settlement gain (6) 8 0 8 0
Gain/(loss) on interest rate swaps (7) 4 2 (2) (7)
Reclassification for periodic settlements (8) 1 2 5 6
Unrealized (gain)/loss (2) 0 0 0
Deferred tax valuation allowance 0 1 0 0
Total other comprehensive income/(loss), net of tax 43 2 70 (1)
Total comprehensive income/(loss), net of tax (85) (65) (300) (192)
Net actuarial gain/(loss) arising during the period, tax (24)   (28)  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Tax Effect       (3)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax   1   3
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax   (4)   (8)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax     (2)  
Other Comprehensive Income (Loss), Defined Benefit Plan, Curtailment Gain (Loss), Tax     (11)  
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement Gain (Loss) tax (4)   (4)  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax $ (1) $ (1) $ 2 $ 3