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Employee Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020 and 2019. 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)
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
20

 
$
19

 
$
—

 
$
1

 
$
—

 
$
—

Interest cost
 
23

 
29

 
2

 
2

 
1

 
1

Expected return on plan assets
 
(67
)
 
(64
)
 
(5
)
 
(4
)
 
—

 
—

Amortization of prior service credit
 
(5
)
 
(7
)
 
(1
)
 
(3
)
 
—

 
—

Recognized net actuarial loss
 
26

 
15

 
1

 
2

 
1

 
1

Total net periodic benefit (income) cost          
 
$
(3
)
 
$
(8
)
 
$
(3
)
 
$
(2
)
 
$
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)
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
63

 
$
57

 
$
1

 
$
2

 
$
—

 
$
—

Interest cost
 
71

 
88

 
5

 
7

 
2

 
3

Expected return on plan assets
 
(200
)
 
(193
)
 
(15
)
 
(13
)
 
—

 
—

Amortization of prior service credit
 
(19
)
 
(20
)
 
(1
)
 
(10
)
 
—

 
—

Recognized net actuarial loss
 
80

 
46

 
1

 
7

 
3

 
2

Total net periodic benefit (income) cost          
 
$
(5
)
 
$
(22
)
 
$
(9
)
 
$
(7
)
 
$
5

 
$
5