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Employee Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The following tables summarize the components of net periodic benefit cost for the three and nine months ended September 30, 2019 and 2018. The components of net periodic benefit cost other than the service cost component are included in other noninterest expense in the income statement.
 
 
Pension Benefits
 
Other Postretirement Benefits
 
Superannuation,
SERP and
ESBP
 
 
For the Three Months Ended September 30,
 
For the Three Months Ended September 30,
 
For the Three Months Ended September 30,
(Dollars in millions)
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
19

 
$
21

 
$
1

 
$
—

 
$
—

 
$
—

Interest cost
 
29

 
25

 
2

 
2

 
1

 
1

Expected return on plan assets
 
(64
)
 
(67
)
 
(4
)
 
(6
)
 
—

 
—

Amortization of prior service credit
 
(7
)
 
(7
)
 
(3
)
 
(3
)
 
—

 
—

Recognized net actuarial loss
 
15

 
21

 
2

 
2

 
1

 
1

Total net periodic benefit (income) cost          
 
$
(8
)
 
$
(7
)
 
$
(2
)
 
$
(5
)
 
$
2

 
$
2


 
 
Pension Benefits
 
Other Postretirement Benefits
 
Superannuation,
SERP and
ESBP
 
 
For the Nine Months Ended September 30,
 
For the Nine Months Ended September 30,
 
For the Nine Months Ended September 30,
(Dollars in millions)
 
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
57

 
$
60

 
$
2

 
$
3

 
$
—

 
$
—

Interest cost
 
88

 
75

 
7

 
6

 
3

 
2

Expected return on plan assets
 
(193
)
 
(201
)
 
(13
)
 
(16
)
 
—

 
—

Amortization of prior service credit
 
(20
)
 
(20
)
 
(10
)
 
(11
)
 
—

 
—

Recognized net actuarial loss
 
46

 
65

 
7

 
4

 
2

 
3

Total net periodic benefit (income) cost          
 
$
(22
)
 
$
(21
)
 
$
(7
)
 
$
(14
)
 
$
5

 
$
5