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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Changes in Benefit Obligation and Plan Assets
The following table sets forth, on an aggregated basis, changes in the benefit obligation and plan assets, the funded status and how the funded status is recognized on our consolidated balance sheets.
Table 14.1: Changes in Benefit Obligation and Plan Assets
 
 
Defined Pension 
Benefits
 
Other Postretirement
Benefits
(Dollars in millions)
 
2019
 
2018
 
2019
 
2018
Change in benefit obligation:
 
 
 
 
 
 
 
 
Accumulated benefit obligation as of January 1,
 
$
157

 
$
178

 
$
29

 
$
35

Service cost
 
1

 
1

 
0

 
0

Interest cost
 
6

 
6

 
1

 
1

Benefits paid
 
(13
)
 
(15
)
 
(2
)
 
(2
)
Actuarial loss (gain)
 
14

 
(13
)
 
(1
)
 
(5
)
Accumulated benefit obligation as of December 31,
 
$
165

 
$
157

 
$
27

 
$
29

Change in plan assets:
 
 
 
 
 
 
 
 
Fair value of plan assets as of January 1,
 
$
218

 
$
246

 
$
6

 
$
6

Actual return on plan assets
 
48

 
(14
)
 
1

 
0

Employer contributions
 
1

 
1

 
1

 
2

Benefits paid
 
(13
)
 
(15
)
 
(2
)
 
(2
)
Fair value of plan assets as of December 31,
 
$
254

 
$
218

 
$
6

 
$
6

Over (under) funded status as of December 31,
 
$
89

 
$
61

 
$
(21
)
 
$
(23
)
 
 
Defined Pension 
Benefits
 
Other Postretirement
Benefits
(Dollars in millions)
 
2019
 
2018
 
2019
 
2018
Balance sheet presentation as of December 31,
 
 
 
 
 
 
 
 
Other assets
 
$
100

 
$
71

 
$
0

 
$
0

Other liabilities
 
(11
)
 
(10
)
 
(21
)
 
(23
)
Net amount recognized as of December 31,
 
$
89

 
$
61

 
$
(21
)
 
$
(23
)