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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2017
Employee Benefit Plans [Abstract]  
Employee Benefit Plans
EMPLOYEE BENEFIT PLANS

Pension and Postretirement Plans
As described in Note 11 Employee Benefit Plans in our 2016 Form 10-K, we have a noncontributory, qualified defined benefit pension plan covering eligible employees. Benefits are determined using a cash balance formula where earnings credits are a percentage of eligible compensation. Any pension contributions to the plan are based on an actuarially determined amount necessary to fund total benefits payable to plan participants. We made a voluntary contribution of $.2 billion in September 2017 to the qualified pension plan.

We also maintain nonqualified supplemental retirement plans for certain employees and provide certain health care and life insurance benefits for qualifying retired employees (postretirement benefits) through various plans. We reserve the right to terminate or make changes to these plans at any time. The nonqualified pension plan is unfunded.
The components of our net periodic benefit cost for the three and nine months ended September 30, 2017 and 2016, respectively, were as follows:

Table 58: Components of Net Periodic Benefit Cost
 
Qualified Pension Plan
 
 
Nonqualified
Retirement Plans
 
 
Postretirement Benefits
 
Three months ended September 30
In millions
2017

 
2016

 
 
2017

 
2016

 
 
2017

 
2016

 
Net periodic cost consists of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
26

 
$
26

 
 
$
1

 
$
1

 
 
$
2

 
$
1

 
Interest cost
45

 
46

 
 
2

 
3

 
 
3

 
4

 
Expected return on plan assets
(71
)
 
(70
)
 
 

 

 
 
(2
)
 
(1
)
 
Amortization of prior service credit
(1
)
 
(2
)
 
 

 

 
 


 


 
Amortization of actuarial losses
11

 
12

 
 
1

 
1

 
 
 
 
 
 
Net periodic cost/(benefit)
$
10

 
$
12

 
 
$
4

 
$
5

 
 
$
3

 
$
4

 
 
Qualified Pension Plan
 
 
Nonqualified
Retirement Plans
 
 
Postretirement Benefits
 
Nine months ended September 30
In millions
2017

 
2016

 
 
2017

 
2016

 
 
2017

 
2016

 
Net periodic cost consists of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
77

 
$
77

 
 
$
2

 
$
2

 
 
$
4

 
$
4

 
Interest cost
134

 
139

 
 
8

 
9

 
 
10

 
11

 
Expected return on plan assets
(213
)
 
(211
)
 
 

 


 
 
(4
)
 
(3
)
 
Amortization of prior service credit
(3
)
 
(5
)
 
 

 


 
 
(1
)
 
(1
)
 
Amortization of actuarial losses
33

 
34

 
 
3

 
3

 
 
 

 
 

 
Net periodic cost/(benefit)
$
28

 
$
34

 
 
$
13

 
$
14

 
 
$
9

 
$
11