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Employee Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 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 six months ended June 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 June 30,
 
For the Three Months Ended June 30,
 
For the Three Months Ended June 30,
(Dollars in millions)
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
22

 
$
19

 
$
1

 
$
—

 
$
—

 
$
—

Interest cost
 
24

 
30

 
1

 
3

 
—

 
1

Expected return on plan assets
 
(66
)
 
(65
)
 
(5
)
 
(5
)
 
—

 
—

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

 
(3
)
 
—

 
—

Recognized net actuarial loss
 
26

 
16

 
—

 
3

 
1

 
—

Total net periodic benefit (income) cost          
 
$
(1
)
 
$
(7
)
 
$
(3
)
 
$
(2
)
 
$
1

 
$
1

 
 
Pension Benefits
 
Other Postretirement Benefits
 
Superannuation,
SERP and
ESBP
 
 
For the Six Months Ended June 30,
 
For the Six Months Ended June 30,
 
For the Six Months Ended June 30,
(Dollars in millions)
 
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
43

 
$
38

 
$
1

 
$
1

 
$
—

 
$
—

Interest cost
 
48

 
59

 
3

 
5

 
1

 
2

Expected return on plan assets
 
(133
)
 
(129
)
 
(10
)
 
(9
)
 
—

 
—

Amortization of prior service credit
 
(14
)
 
(13
)
 
—

 
(7
)
 
—

 
—

Recognized net actuarial loss
 
54

 
31

 
—

 
5

 
2

 
1

Total net periodic benefit (income) cost          
 
$
(2
)
 
$
(14
)
 
$
(6
)
 
$
(5
)
 
$
3

 
$
3