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Employee Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The costs of the Company's defined benefit pension plans and other postretirement plans for the three and nine months ended September 30, 2016 and 2015, were as follows:
 
 
Three Months Ended
September 30
 
Nine Months Ended
September 30
 
 
Pension Benefits
 
Other Benefits
 
Pension Benefits
 
Other Benefits
($ in millions)
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Components of Net Periodic Benefit Cost
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
34

 
$
38

 
$
2

 
$
3

 
$
100

 
$
112

 
$
7

 
$
10

Interest cost
 
65

 
61

 
6

 
7

 
196

 
182

 
19

 
20

Expected return on plan assets
 
(87
)
 
(88
)
 
—

 
—

 
(260
)
 
(263
)
 
—

 
—

Amortization of prior service cost (credit)
 
5

 
4

 
(5
)
 
(5
)
 
14

 
14

 
(14
)
 
(15
)
Amortization of net actuarial loss (gain)
 
21

 
21

 
(1
)
 
1

 
63

 
64

 
(4
)
 
2

Net periodic benefit cost
 
$
38

 
$
36

 
$
2

 
$
6

 
$
113


$
109


$
8


$
17
Schedule of Defined Benefit Plans Disclosures, Cash Contributions
The Company made the following contributions to its pension and other postretirement plans for the nine months ended September 30, 2016 and 2015:
 
 
Nine Months Ended
September 30
($ in millions)
 
2016
 
2015
Pension plans
 
 
 
 
Qualified minimum
 
$
—

 
$
—

Discretionary
 
 
 
 
Qualified
 
167

 
99

Non-qualified
 
4

 
3

Other benefit plans
 
26

 
25

Total contributions
 
$
197

 
$
127