Employee Benefit Plans - MEC - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension | MEC
Defined Benefit Plan Disclosure [Line Items]
Curtailment	$ (1)		$ (10)
Settlement		$ (3)	4
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	8	11
Interest cost	29	30	20
Expected return on plan assets	(36)	(33)	(29)
Curtailment	0	0	0
Settlement	0	0	0
Net amortization	(1)	(2)	(1)
Net periodic benefit cost	(1)	3	1
Other Postretirement | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	5	8
Interest cost	13	13	8
Expected return on plan assets	(16)	(14)	(14)
Curtailment	0	0	0
Settlement	0	0	0
Net amortization	1	0	(2)
Net periodic benefit cost	3	4	0
Other Postretirement | MidAmerican Energy | MEC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	1	2	(2)
U.S. | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	15	22
Interest cost	105	110	83
Expected return on plan assets	(126)	(123)	(108)
Curtailment	(1)	0	(10)
Settlement	0	(3)	17
Net amortization	9	14	19
Net periodic benefit cost	1	13	23
U.S. | Pension | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	10	15
Interest cost	31	32	23
Expected return on plan assets	(31)	(30)	(27)
Curtailment	(1)	0	(10)
Settlement	0	(3)	4
Net amortization	(1)	0	1
Net periodic benefit cost	7	9	6
U.S. | Pension | MidAmerican Energy | MEC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 4	$ 5	$ 2