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Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2019
Postemployment Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block] The following tables contain information at the dates indicated about the obligations and funded status of the Company’s other postretirement plans.
 
December 31,
 
2019
 
2018
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of period
$
78

 
$
25

Service cost
1

 
1

Interest cost
3

 
2

Amendments
—

 
56

Actuarial gain
12

 
(3
)
Benefits paid, net
(3
)
 
(3
)
Benefit obligation at end of period
$
91

 
$
78

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of period
$
141

 
$
143

Return on plan assets and other
23

 
(7
)
Employer contributions
8

 
8

Benefits paid, net
(3
)
 
(3
)
Fair value of plan assets at end of period
$
169

 
$
141

 
 
 
 
Amount overfunded at end of period (1)
$
78

 
$
63

 
 
 
 
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:
 
 
 
Net actuarial gain
$
(5
)
 
$
(2
)
Prior service cost
37

 
61

 
$
32

 
$
59

(1) 
Recorded as a non-current asset in the consolidated balance sheets.
Schedule of Net Benefit Costs [Table Text Block]
The following tables set forth the components of net periodic benefit cost of the Company’s postretirement benefit plan for the periods presented:
 
Years Ended December 31,
 
2019
 
2018
 
2017
Service cost
$
1

 
$
1

 
$
—

Interest cost
3

 
2

 
1

Expected return on plan assets
(7
)
 
(7
)
 
(7
)
Prior service credit amortization
24

 
14

 
1

Net periodic benefit cost
$
21

 
$
10

 
$
(5
)
Defined Benefit Plan, Assumptions [Table Text Block]
The weighted-average assumptions used in determining net periodic benefit cost for the periods presented are shown in the table below:
 
Years Ended December 31,
 
2019
 
2018
 
2017
Discount rate
4.05
%
 
3.44
%
 
3.75
%
Expected return on assets:
 
 
 
 
 
Tax exempt accounts
7.00
%
 
7.00
%
 
7.00
%
Taxable accounts
4.75
%
 
4.75
%
 
4.50
%
Schedule of Health Care Cost Trend Rates [Table Text Block]
The assumed health care cost trend weighted-average rates used to measure the expected cost of benefits covered by the plans are shown in the table below:
 
December 31,
 
2019
 
2018
Health care cost trend rate
8.05
%
 
8.49
%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
4.65
%
 
4.85
%
Year that the rate reaches the ultimate trend rate
2027

 
2026
Schedule of Allocation of Plan Assets [Table Text Block]
The fair value of the Company’s other postretirement plan assets at the dates indicated by asset category is as follows:
 
December 31,
 
2019
 
2018
Cash and cash equivalents
$
9

 
$
14

Total Market Index Fund  (1)
73

 
53

Total International Index Fund  (2)
17

 
13

U.S. Bond Index Fund  (3)
70

 
61

Total
$
169

 
$
141
Schedule of Expected Benefit Payments [Table Text Block]
Benefit Payments. The Company’s estimate of expected benefit payments, which reflect expected future service, as appropriate, in each of the next five years and in the aggregate for the five years thereafter are shown in the table below.
Years
 
Expected Benefit Payments
2020
 
$
4

2021
 
5

2022
 
6

2023
 
6

2024
 
6

2025 – 2029
 
25