Retirement Benefit Plans
 6 Months Ended
Aug. 01, 2015
Retirement Benefit Plans [Abstract]  
Retirement Benefit Plans
Retirement Benefit Plans
The components of net periodic benefit expense/(income) for our non-contributory qualified defined benefit pension plan (Primary Pension Plan), non-contributory supplemental pension plans and contributory postretirement health and welfare plan were as follows:
 
Three Months Ended
 
Six Months Ended
($ in millions)
August 1,
2015
 
August 2,
2014
 
August 1,
2015
 
August 2,
2014
Primary Pension Plan
 
 
 
 
 
 
 
Service cost
$
18

 
$
16

 
$
35

 
$
31

Interest cost
49

 
52

 
98

 
105

Other cost
3

 
—

 
3

 
—

Expected return on plan assets
(89
)
 
(87
)
 
(178
)
 
(174
)
Amortization of actuarial loss/(gain)
25

 
12

 
51

 
25

Amortization of prior service cost/(credit)
2

 
3

 
4

 
4

Net periodic benefit expense/(income)
$
8

 
$
(4
)
 
$
13

 
$
(9
)
 
 
 
 
 
 
 
 
Supplemental Pension Plans
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
1

 
2

 
3

 
4

Amortization of actuarial loss/(gain)
4

 
4

 
7

 
8

Amortization of prior service cost/(credit)
—

 
—

 
—

 
—

Net periodic benefit expense/(income)
$
5

 
$
6

 
$
10

 
$
12

 
 
 
 
 
 
 
 
Primary and Supplemental Pension Plans Total
 
 
 
 
 
 
 
Service cost
$
18

 
$
16

 
$
35

 
$
31

Interest cost
50

 
54

 
101

 
109

Other cost
3

 
—

 
3

 
—

Expected return on plan assets
(89
)
 
(87
)
 
(178
)
 
(174
)
Amortization of actuarial loss/(gain)
29

 
16

 
58

 
33

Amortization of prior service cost/(credit)
2

 
3

 
4

 
4

Net periodic benefit expense/(income)
$
13

 
$
2

 
$
23

 
$
3

 
 
 
 
 
 
 
 
Postretirement Health and Welfare Plan
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
—

 
—

 
—

 
—

Amortization of actuarial loss/(gain)
—

 
—

 
—

 
—

Amortization of prior service cost/(credit)
(2
)
 
(2
)
 
(4
)
 
(4
)
Net periodic benefit expense/(income)
$
(2
)
 
$
(2
)
 
$
(4
)
 
$
(4
)
 
 
 
 
 
 
 
 
Retirement Benefit Plans Total
 
 
 
 
 
 
 
Service cost
$
18

 
$
16

 
$
35

 
$
31

Interest cost
50

 
54

 
101

 
109

Other cost
3

 
—

 
3

 
—

Expected return on plan assets
(89
)
 
(87
)
 
(178
)
 
(174
)
Amortization of actuarial loss/(gain)
29

 
16

 
58

 
33

Amortization of prior service cost/(credit)
—

 
1

 
—

 
—

Net periodic benefit expense/(income)
$
11

 
$
—

 
$
19

 
$
(1
)

Net periodic benefit expense/(income) for our noncontributory postretirement health and welfare plan was predominantly included in SG&A expense in the unaudited Interim Consolidated Statements of Operations.
Primary Pension Plan Lump-Sum Payment Offer
In August 2015, as a result of a plan amendment, we offered approximately 31,000 retirees and beneficiaries in the Primary Pension Plan who commenced their benefit between January 1, 2000 and August 31, 2012 the option to receive a lump-sum settlement payment. In addition, we also offered approximately 8,000 participants in the Primary Pension Plan who separated from service and had a deferred vested benefit as of August 31, 2012 the option to receive a lump-sum settlement payment.  These participants have until September 18, 2015 to elect to receive the lump-sum settlement payment with the payments to be made by the Company beginning on November 2, 2015 using assets from the Primary Pension Plan.  Accordingly, the settlement expense related to the lump sum payments will be recognized in the fourth quarter of 2015.
Defined Contribution Plans
Our defined contribution plans include a qualified Savings, Profit-Sharing and Stock Ownership Plan (401(k) plan), which includes a non-contributory retirement account, and a non-qualified contributory unfunded mirror savings plan offered to certain members of management. Total expense for our defined contribution plans for each of the second quarters of 2015 and 2014 was $14 million and $13 million, respectively, and was predominantly included in SG&A expenses in the unaudited Interim Consolidated Statements of Operations. Total expense for the first six months of 2015 and 2014 was $27 million and $26 million, respectively.