Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019
Change in benefit obligation:
Benefit obligation at beginning of period	$	91	$	78
Service cost	1		1
Interest cost	3		3
Actuarial loss	7		12
Benefits paid, net	(4)		(3)
Benefit obligation at end of period	$	98	$	91
Change in plan assets:
Fair value of plan assets at beginning of period	$	169	$	141
Return on plan assets and other	18		23
Employer contributions	8		8
Benefits paid, net	(4)		(3)
Fair value of plan assets at end of period	$	191	$	169
Amount overfunded at end of period (1)	$	93	$	78
Amounts recognized in accumulated other comprehensive loss (pre-tax basis) consist of:
Net actuarial gain	$	(8)	$	(5)
Prior service cost	19		37
	$	11	$	32

(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,
	2020		2019		2018
Service cost	$	1	$	1	$	1
Interest cost	3		3		2
Expected return on plan assets	(9)		(7)		(7)
Prior service credit amortization	18		24		14
Net periodic benefit cost	$	13	$	21	$	10

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,
	2020		2019		2018
Discount rate	3.00	%	4.05	%	3.44	%
Expected return on assets:
Tax exempt accounts	7.00	%	7.00	%	7.00	%
Taxable accounts	4.75	%	4.75	%	4.75	%

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,
	2020		2019
Health care cost trend rate	8.05	%	8.05	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.65	%	4.65	%
Year that the rate reaches the ultimate trend rate	2028		2027

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,
	2020		2019
Cash and cash equivalents	$	11	$	9
Total Market Index Fund (1)	87		73
Total International Index Fund(2)	18		17
U.S. Bond Index Fund (3)	75		70
Total	$	191	$	169

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
2021	$	5
2022	5
2023	6
2024	6
2025	5
2026-2030	25