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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Employee Benefit Plans [Abstract]  
Components of Net Periodic Benefit Cost
The components of our net periodic benefit cost for the three months ended March 31, 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 March 31
In millions
2018

 
2017

 
 
2018

 
2017

 
 
2018

 
2017

 
Net periodic cost consists of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
28

 
$
26

 
 
$
1

 
$
1

 
 
$
1

 
$
1

 
Interest cost
43

 
45

 
 
2

 
3

 
 
3

 
4

 
Expected return on plan assets
(76
)
 
(71
)
 
 
 
 
 
 
 
(1
)
 
(1
)
 
Amortization of prior service credit
 
 
(1
)
 
 
 
 
 
 
 
 
 
 
 
Amortization of actuarial losses
 
 
12

 
 
1

 
1

 
 
 
 
 
 
Net periodic cost/(benefit)
$
(5
)
 
$
11

 
 
$
4

 
$
5

 
 
$
3

 
$
4

 

(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.