Retirement and Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan cost	$ 2	$ 2	$ 2
Contributions capitalized	$ 2	2	1
Defined benefit plan, lump sum payment distribution, percentage of pension assets	40.00%
Defined benefit plan, funded (unfunded) status of plan	$ 15
Defined benefit plan, assumptions used calculating benefit obligation, weighted-average interest crediting rate	6.00%
Defined benefit plan, funded (unfunded) status of plan, excluding settlement payment distributions	$ 17
Defined benefit plan, plan assets, period increase (decrease)	(2)
Defined benefit plan included in accumulated other comprehensive (income) loss, before tax	8	23
Defined benefit plan included in accumulated other comprehensive (income) loss after tax	7	18
Other comprehensive (income) loss, defined benefit plan, after tax and reclassification adjustment, attributable to parent	31	13	(5)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, funded (unfunded) status of plan	15	(12)
Settlement (gain) loss	(1)	2	0
Settlements	40	8
Decrease for remeasurement due to settlement		4
Other comprehensive (income) loss, defined benefit plan, after tax and reclassification adjustment, attributable to parent	27	11
Employer contributions	0	12
Defined benefit plan, plan assets, lump sum payment	38
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, funded (unfunded) status of plan	(9)	(13)
Settlement (gain) loss	0	0	$ 0
Settlements	0	0
Other comprehensive (income) loss, defined benefit plan, after tax and reclassification adjustment, attributable to parent	4	2
Employer contributions	$ 1	$ 1