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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Employee Benefit Plans [Abstract]  
Components of Net Periodic Benefit Cost
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.