Employee Benefit Plans - MEC - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Postretirement
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 769	$ 744
Employer contributions	8	14
Participant contributions	8	9
Actual return on plan assets	(122)	53
Settlement	0	0
Benefits paid	(49)	(51)
Ending balance	614	769	$ 744
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	714	758
Service cost	11	12	7
Interest cost	20	19	21
Participant contributions	8	9
Actuarial (gain) loss	(155)	(35)
Amendment	20	2
Curtailment	0	0
Settlement	0	0
Benefits Paid	(49)	(51)
Ending balance	569	714	758
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Plan assets at fair value, end of year	614	769	744
Benefit obligation, end of year	569	714	758
Funded status	45	55
Other assets	52	60
Other current liabilities	0	0
Other long-term liabilities	(7)	(5)
Amounts recognized	45	55
Supplemental Employee Retirement Plan
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Rabbi trusts	300	343
MEC
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Rabbi trusts	215	233
MEC | Other Postretirement
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	308	278
Employer contributions	3	10
Participant contributions	1	1
Actual return on plan assets	(58)	34
Settlement	0	0
Benefits paid	(14)	(15)
Ending balance	240	308	278
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	285	304
Service cost	8	9	4
Interest cost	8	8	7
Participant contributions	1	1
Actuarial (gain) loss	(64)	(18)
Amendment	19	1
Curtailment	0	0
Settlement	0	0
Acquisition	0	(5)
Benefits Paid	(14)	(15)
Ending balance	243	285	304
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Plan assets at fair value, end of year	240	308	278
Benefit obligation, end of year	243	285	304
Funded status	(3)	23
Other assets	0	23
Other current liabilities	0	0
Other long-term liabilities	(3)	0
Amounts recognized	(3)	23
MidAmerican Energy | MEC | Supplemental Employee Retirement Plan
Defined Benefit Plans, Supplemental Employee Retirement Plans [Abstract]
Rabbi trusts	134	143
U.S. | Pension
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	2,795	2,824
Employer contributions	14	13
Participant contributions	0	0
Actual return on plan assets	(491)	234
Settlement	(164)	(134)
Benefits paid	(141)	(142)
Ending balance	2,013	2,795	2,824
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	2,777	3,077
Service cost	22	30	17
Interest cost	83	78	93
Participant contributions	0	0
Actuarial (gain) loss	(524)	(132)
Amendment	(3)	0
Curtailment	(10)	0
Settlement	(164)	(134)
Benefits Paid	(141)	(142)
Ending balance	2,040	2,777	3,077
Accumulated benefit obligation, end of year	2,003	2,713
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Plan assets at fair value, end of year	2,013	2,795	2,824
Benefit obligation, end of year	2,040	2,777	3,077
Funded status	(27)	18
Other assets	125	204
Other current liabilities	(13)	(13)
Other long-term liabilities	(139)	(173)
Amounts recognized	(27)	18
U.S. | MEC | Pension
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	704	718
Employer contributions	7	8
Participant contributions	0	0
Actual return on plan assets	(130)	58
Settlement	(57)	(46)
Benefits paid	(34)	(34)
Ending balance	490	704	718
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	781	845
Service cost	15	20	8
Interest cost	23	22	25
Participant contributions	0	0
Actuarial (gain) loss	(129)	(25)
Amendment	(3)	0
Curtailment	(10)	0
Settlement	(57)	(46)
Acquisition	0	(1)
Benefits Paid	(34)	(34)
Ending balance	586	781	845
Accumulated benefit obligation, end of year	551	721
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Plan assets at fair value, end of year	490	704	718
Benefit obligation, end of year	586	781	$ 845
Funded status	(96)	(77)
Other assets	0	34
Other current liabilities	(8)	(7)
Other long-term liabilities	(88)	(104)
Amounts recognized	(96)	(77)
U.S. | MEC | Supplemental Employee Retirement Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning balance	111
Ending balance	85	111
Accumulated benefit obligation, end of year	85	111
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Benefit obligation, end of year	$ 85	$ 111