Retirement and Employee Benefit Plans (Pension and Other Postretirement Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 7
Interest cost	3	4	5
Expected return on plan assets	0	(4)	(6)
Amortization of prior service cost	(1)	0	0
Amortization of net loss	0	0	1
Net periodic benefit cost	2	0	7
Settlement (gain) loss	(1)	2	0
Total benefit cost	1	2	7
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	2
Interest cost	0	0	0
Expected return on plan assets	0	0	0
Amortization of prior service cost	0	0	0
Amortization of net loss	0	0	0
Net periodic benefit cost	2	2	2
Settlement (gain) loss	0	0	0
Total benefit cost	$ 2	$ 2	$ 2