Employee Benefit Plans - MEC - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension | MEC
Defined Benefit Plan Disclosure [Line Items]
Curtailment	$ (10)
Settlement	4	$ (5)
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	12	$ 7
Interest cost	20	19	21
Expected return on plan assets	(29)	(22)	(34)
Curtailment	0	0	0
Settlement	0	0	0
Net amortization	(1)	(3)	(4)
Net periodic benefit cost (credit)	1	6	(10)
Other Postretirement | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	9	4
Interest cost	8	8	7
Expected return on plan assets	(14)	(10)	(14)
Curtailment	0	0	0
Settlement	0	0	0
Net amortization	(2)	(4)	(5)
Net periodic benefit cost (credit)	0	3	(8)
Other Postretirement | MidAmerican Energy | MEC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	(2)	1	(5)
U.S. | Pension
Defined Benefit Plan Disclosure [Line Items]
Service cost	22	30	17
Interest cost	83	78	93
Expected return on plan assets	(108)	(134)	(140)
Curtailment	(10)	0	0
Settlement	17	3	0
Net amortization	19	25	32
Net periodic benefit cost (credit)	23	2	2
U.S. | Pension | MEC
Defined Benefit Plan Disclosure [Line Items]
Service cost	15	20	8
Interest cost	23	22	25
Expected return on plan assets	(27)	(37)	(40)
Curtailment	(10)	0	0
Settlement	4	(5)	0
Net amortization	1	1	1
Net periodic benefit cost (credit)	6	1	(6)
U.S. | Pension | MidAmerican Energy | MEC
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost (credit)	$ (2)	$ (20)	$ (13)