Retirement and Employee Benefit Plans (Pension and Other Postretirement Benefit Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Settlement (gain) loss	$ 2
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	$ 0	$ 0
Interest cost	0	3	4
Expected return on plan assets	0	0	(4)
Amortization of prior service cost	0	(1)	0
Amortization of net loss	0	0	0
Net periodic benefit cost	0	2	0
Settlement (gain) loss	2	(1)	2
Total benefit cost	2	1	2
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	2
Interest cost	1	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	3	2	2
Settlement (gain) loss	0	0	0
Total benefit cost	$ 3	$ 2	$ 2