Employee Benefit Plans - MEC - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Postretirement
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 614	$ 769
Employer contributions	6	8
Participant contributions	8	8
Actual return on plan assets	86	(122)
Settlement	0	0
Benefits paid	(49)	(49)
Ending balance	665	614	$ 769
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	569	714
Service cost	8	11	12
Interest cost	30	20	19
Participant contributions	8	8
Actuarial loss (gain)	(1)	(155)
Amendment	0	20
Curtailment	0	0
Settlement	0	0
Benefits Paid	(49)	(49)
Ending balance	565	569	714
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Plan assets at fair value, end of year	665	614	769
Benefit obligation, end of year	565	569	714
Funded status	100	45
Other assets	104	52
Other current liabilities	0	0
Other long-term liabilities	(4)	(7)
Amounts recognized	100	45
Supplemental Employee Retirement Plan
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Rabbi trusts	341	300
MEC
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Rabbi trusts	239	215
MEC | Other Postretirement
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	240	308
Employer contributions	3	3
Participant contributions	1	1
Actual return on plan assets	51	(58)
Settlement	0	0
Benefits paid	(17)	(14)
Ending balance	278	240	308
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	243	285
Service cost	5	8	9
Interest cost	13	8	8
Participant contributions	1	1
Actuarial loss (gain)	(4)	(64)
Amendment	0	19
Curtailment	0	0
Settlement	0	0
Benefits Paid	(17)	(14)
Ending balance	241	243	285
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Plan assets at fair value, end of year	278	240	308
Benefit obligation, end of year	241	243	285
Funded status	37	(3)
Other assets	37	0
Other current liabilities	0	0
Other long-term liabilities	0	(3)
Amounts recognized	37	(3)
MidAmerican Energy | MEC | Supplemental Employee Retirement Plan
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Rabbi trusts	149	134
U.S. | Pension
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,013	2,795
Employer contributions	14	14
Participant contributions	0	0
Actual return on plan assets	219	(491)
Settlement	0	(164)
Benefits paid	(177)	(141)
Ending balance	2,069	2,013	2,795
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	2,040	2,777
Service cost	15	22	30
Interest cost	110	83	78
Participant contributions	0	0
Actuarial loss (gain)	62	(524)
Amendment	0	(3)
Curtailment	0	(10)
Settlement	0	(164)
Benefits Paid	(177)	(141)
Ending balance	2,050	2,040	2,777
Accumulated benefit obligation, end of year	2,013	2,003
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Plan assets at fair value, end of year	2,069	2,013	2,795
Benefit obligation, end of year	2,050	2,040	2,777
Funded status	19	(27)
Other assets	160	125
Other current liabilities	(13)	(13)
Other long-term liabilities	(128)	(139)
Amounts recognized	19	(27)
U.S. | MEC | Pension
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	490	704
Employer contributions	7	7
Participant contributions	0	0
Actual return on plan assets	64	(130)
Settlement	0	(57)
Benefits paid	(45)	(34)
Ending balance	516	490	704
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	586	781
Service cost	10	15	20
Interest cost	32	23	22
Participant contributions	0	0
Actuarial loss (gain)	15	(129)
Amendment	0	(3)
Curtailment	0	(10)
Settlement	0	(57)
Benefits Paid	(45)	(34)
Ending balance	598	586	781
Accumulated benefit obligation, end of year	564	551
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Plan assets at fair value, end of year	516	490	704
Benefit obligation, end of year	598	586	$ 781
Funded status	(82)	(96)
Other assets	3	0
Other current liabilities	(8)	(8)
Other long-term liabilities	(77)	(88)
Amounts recognized	(82)	(96)
U.S. | MEC | Supplemental Employee Retirement Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	85
Ending balance	85	85
Accumulated benefit obligation, end of year	85	85
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Benefit obligation, end of year	$ 85	$ 85