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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2018
Employee Benefit Plans [Abstract]  
Employee Benefit Plans
NOTE 8 EMPLOYEE BENEFIT PLANS

Pension and Postretirement Plans

As described in Note 11 Employee Benefit Plans in our 2017 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. Beginning in 2018, these earnings credits are subject to a minimum annual amount. 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 2018 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 components of our net periodic benefit cost for the three and nine months ended September 30, 2018 and 2017, respectively, were as follows:
 
Table 62: Components of Net Periodic Benefit Cost (a)
 
Qualified Pension Plan
 
 
Nonqualified Pension Plan
 
 
Postretirement Benefits
 
Three months ended September 30
In millions
2018

 
2017

 
 
2018

 
2017

 
 
2018

 
2017

 
Net periodic cost consists of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
29

 
$
26

 
 
$
1

 
$
1

 
 
$
1

 
$
2

 
Interest cost
43

 
45

 
 
2

 
2

 
 
3

 
3

 
Expected return on plan assets
(76
)
 
(71
)
 
 
 
 

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

 
 
 
 


 
Amortization of actuarial losses
 
 
11

 
 
1

 
1

 
 
 
 
 
 
Net periodic cost/(benefit)
$
(4
)
 
$
10

 
 
$
4

 
$
4

 
 
$
3

 
$
3

 

 
Qualified Pension Plan
 
 
Nonqualified Pension Plan
 
 
Postretirement Benefits
 
Nine months ended September 30
In millions
2018

 
2017

 
 
2018

 
2017

 
 
2018

 
2017

 
Net periodic cost consists of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
87

 
$
77

 
 
$
2

 
$
2

 
 
$
3

 
$
4

 
Interest cost
128

 
134

 
 
7

 
8

 
 
9

 
10

 
Expected return on plan assets
(229
)
 
(213
)
 
 
 
 

 
 
(4
)
 
(4
)
 
Amortization of prior service credit
1

 
(3
)
 
 
 
 

 
 
 
 
(1
)
 
Amortization of actuarial losses
 
 
33

 
 
3

 
3

 
 
 
 
 
 
Net periodic cost/(benefit)
$
(13
)
 
$
28

 
 
$
12

 
$
13

 
 
$
8

 
$
9

 
(a)
The service cost component is included in Personnel expense on the Consolidated Income Statement. All other components are included in Other noninterest expense on the Consolidated Income Statement.