Employee Benefit Plans - MEC - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension | MEC
Defined Benefit Plan Disclosure [Line Items]
Curtailment	$ (10)
Settlement	(3)	$ 4
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	11	$ 12
Interest cost	30	20	19
Expected return on plan assets	(33)	(29)	(22)
Curtailment	0	0	0
Settlement	0	0	0
Net amortization	(2)	(1)	(3)
Net periodic benefit cost	3	1	6
Other Postretirement | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	8	9
Interest cost	13	8	8
Expected return on plan assets	(14)	(14)	(10)
Curtailment	0	0	0
Settlement	0	0	0
Net amortization	0	(2)	(4)
Net periodic benefit cost	4	0	3
Other Postretirement | MidAmerican Energy | MEC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	2	(2)	1
U.S. | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	15	22	30
Interest cost	110	83	78
Expected return on plan assets	(123)	(108)	(134)
Curtailment	0	(10)	0
Settlement	(3)	17	3
Net amortization	14	19	25
Net periodic benefit cost	13	23	2
U.S. | Pension | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	15	20
Interest cost	32	23	22
Expected return on plan assets	(30)	(27)	(37)
Curtailment	0	(10)	0
Settlement	(3)	4	(5)
Net amortization	0	1	1
Net periodic benefit cost	9	6	1
U.S. | Pension | MidAmerican Energy | MEC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ (5)	$ (2)	$ (20)