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Retirement Benefits (Tables)
 12 Months Ended
Dec. 31, 2021
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,
20212020
Change in benefit obligation:
Benefit obligation at beginning of period
$98 $91 
Service cost
1 1 
Interest cost
2 3 
Actuarial loss1 7 
Benefits paid, net
(4)(4)
Benefit obligation at end of period
$98 $98 
Change in plan assets:
Fair value of plan assets at beginning of period
$191 $169 
Return on plan assets and other
23 18 
Employer contributions
8 8 
Benefits paid, net
(4)(4)
Fair value of plan assets at end of period
$218 $191 
Amount overfunded at end of period (1)
$120 $93 
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:
Net actuarial gain
$(21)$(8)
Prior service cost
18 19 
$(3)$11 
(1)Recorded as a non-current asset in the consolidated balance sheets with a non-current pension liability for overfunded amounts owed to the Company’s shippers.
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,
202120202019
Service cost
$1 $1 $1 
Interest cost
2 3 3 
Expected return on plan assets
(10)(9)(7)
Prior service credit amortization
1 18 24 
Net periodic benefit cost$(6)$13 $21 
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,
202120202019
Discount rate
2.18 %3.00 %4.05 %
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,
20212020
Health care cost trend rate
8.10 %8.05 %
Rate to which the cost trend is assumed to decline (the ultimate trend rate)
4.90 %4.65 %
Year that the rate reaches the ultimate trend rate
20292028
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,
20212020
Cash and cash equivalents
$14 $11 
Total Market Index Fund (1)
111 87 
Total International Index Fund(2)
19 18 
U.S. Bond Index Fund (3)
74 75 
Total
$218 $191 
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.
YearsExpected Benefit Payments
2022$6 
20236 
20246 
20256 
20266 
2027-203126