Retirement and Employee Benefit Plans (Changes in Plans Benefit Obligations, Fair Value of Assets, and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in plan assets:
Funded status of plans at December 31 (1)	$ 15
Other employee-related liabilities	1	$ 1
Pension Benefits
Change in benefit obligations:
Benefit obligation at January 1	126	139
Service cost	0	0	$ 7
Interest cost	3	4	5
Actuarial gain	(29)	(4)
Benefits paid	(2)	(2)
Plan amendments	(2)	0
Settlements	(39)	(11)
Benefit obligation at December 31	57	126	139
Change in plan assets:
Fair value of plan assets at January 1	114	106
Actual return on plan assets	0	6
Employer contributions	0	12
Benefits paid	(2)	(2)
Settlements	(40)	(8)
Fair value of plan assets at December 31	72	114	106
Funded status of plans at December 31 (1)	15	(12)
Other Postretirement Benefits
Change in benefit obligations:
Benefit obligation at January 1	13	13
Service cost	2	2	2
Interest cost	0	0	0
Actuarial gain	(5)	(2)
Benefits paid	(1)	0
Plan amendments	0	0
Settlements	0	0
Benefit obligation at December 31	9	13	13
Change in plan assets:
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Employer contributions	1	1
Benefits paid	(1)	(1)
Settlements	0	0
Fair value of plan assets at December 31	0	0	$ 0
Funded status of plans at December 31 (1)	$ (9)	$ (13)