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Benefits (Tables)
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of period
$
19

 
$
21

Interest cost
1

 
1

Amendments
8

 
—

Actuarial gain
(1
)
 
(1
)
Benefits paid, net
(2
)
 
(2
)
Benefit obligation at end of period
$
25

 
$
19

Change in plan assets:
 
 
 
Fair value of plan assets at beginning of period
$
126

 
$
118

Return on plan assets and other
11

 
2

Employer contributions
8

 
8

Benefits paid, net
(2
)
 
(2
)
Fair value of plan assets at end of period
$
143

 
$
126

 
 
 
 
Amount overfunded at end of period (1)
$
118

 
$
107

 
 
 
 
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:
 
 
 
Net actuarial gain
$
(13
)
 
$
(7
)
Prior service cost
20

 
14

 
$
7

 
$
7

(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,
 
2017
 
2016
 
2015
Interest cost
$
1

 
$
1

 
$
1

Expected return on plan assets
(7
)
 
(6
)
 
(6
)
Prior service credit amortization
1

 
1

 
1

Actuarial loss amortization
—

 
(1
)
 
(1
)
Net periodic benefit cost
$
(5
)
 
$
(5
)
 
$
(5
)
Schedule of Assumptions Used [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,
 
2017
 
2016
 
2015
Discount rate
3.75
%
 
3.88
%
 
3.60
%
Expected return on assets:
 
 
 
 
 
Tax exempt accounts
7.00
%
 
7.00
%
 
7.00
%
Taxable accounts
4.50
%
 
4.50
%
 
4.50
%
Schedule of Health Care Cost Trend Rates [Table Text Block]
The assumed health care cost trend rates used to measure the expected cost of benefits covered by the plans are shown in the table below:
 
December 31,
 
2017
 
2016
Health care cost trend rate
8.10
%
 
8.10
%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
4.95
%
 
4.70
%
Year that the rate reaches the ultimate trend rate
2025

 
2024
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
Assumed health care cost trend rates have a significant effect on the amounts reported for health care plans.  A one-percentage-point change in assumed health care cost trend rates would have the following effects:
 
One Percentage
Point Increase
 
One Percentage
Point Decrease
Effect on accumulated postretirement benefit obligation
$
3

 
$
(3
)
Effect on total of annual service and interest cost components
—

 
—
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,
 
2017
 
2016
Cash and cash equivalents
$
12

 
$
8

Target 2020 Fund  (1)
123

 
112

Target 2050 Fund  (2)
8

 
6

Total
$
143

 
$
126
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
2018
 
$
1

2019
 
1

2020
 
1

2021
 
1

2022
 
1

2023 – 2027
 
7