Long-term Debt - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Par value	$ 52,313
Subsidiary debt, current	2,740	$ 3,201
Subsidiary debt, noncurrent	36,231	35,238
Maturity Schedule
2024	2,740
2025	2,674
2026	1,450
2027	865
2028	1,271
2029 and thereafter	43,313
MidAmerican Energy
Maturity Schedule
Eligible property subject to lien of mortgages	24,000
MEC
Debt Instrument [Line Items]
Par value	8,876
Subsidiary debt	8,766	7,729
Subsidiary debt, current	539	317
Subsidiary debt, noncurrent	8,227	7,412
Maturity Schedule
2024	539
2025	17
2026	4
2027	379
2028	4
2029 and thereafter	$ 7,933
MEC | Committed common equity percentage to regulators
Maturity Schedule
Common equity to total capitalization percentage	42.00%
MEC | Committed common equity percentage to regulators beyond companies control
Maturity Schedule
Common equity to total capitalization percentage below which reasonable efforts to maintain agreed to percentage is not required	39.00%
MEC | Common equity level to total capitalization
Maturity Schedule
Common equity level to total capitalization	55.00%
MEC | Dividend restriction for common equity commitment
Maturity Schedule
Amount available for dividend distribution	$ 3,600
3.70%, due 2023 | MEC
Debt Instrument [Line Items]
Stated rate	3.70%
Par value	$ 0
Subsidiary debt	$ 0	250
3.50%, due 2024 | MEC
Debt Instrument [Line Items]
Stated rate	3.50%
Par value	$ 500
Subsidiary debt	$ 500	500
3.10%, due 2027 | MEC
Debt Instrument [Line Items]
Stated rate	3.10%
Par value	$ 375
Subsidiary debt	$ 374	374
3.65%, due 2029 | MEC
Debt Instrument [Line Items]
Stated rate	3.65%
Par value	$ 850
Subsidiary debt	$ 858	859
4.80%, due 2043 | MEC
Debt Instrument [Line Items]
Stated rate	4.80%
Par value	$ 350
Subsidiary debt	$ 347	347
4.40%, due 2044 | MEC
Debt Instrument [Line Items]
Stated rate	4.40%
Par value	$ 400
Subsidiary debt	$ 396	395
4.25%, due 2046 | MEC
Debt Instrument [Line Items]
Stated rate	4.25%
Par value	$ 450
Subsidiary debt	$ 446	446
3.95%, due 2047 | MEC
Debt Instrument [Line Items]
Stated rate	3.95%
Par value	$ 475
Subsidiary debt	$ 471	471
3.65%, due 2048 | MEC
Debt Instrument [Line Items]
Stated rate	3.65%
Par value	$ 700
Subsidiary debt	$ 690	689
4.25%, due 2049 | MEC
Debt Instrument [Line Items]
Stated rate	4.25%
Par value	$ 900
Subsidiary debt	$ 876	875
3.15%, due 2050 | MEC
Debt Instrument [Line Items]
Stated rate	3.15%
Par value	$ 600
Subsidiary debt	$ 592	592
2.70%, due 2052 | MEC
Debt Instrument [Line Items]
Stated rate	2.70%
Par value	$ 500
Subsidiary debt	$ 492	492
5.35%, due 2034 | MEC
Debt Instrument [Line Items]
Stated rate	5.35%
Par value	$ 350
Subsidiary debt	$ 347	0
5.85%, due 2054 | MEC
Debt Instrument [Line Items]
Stated rate	5.85%
Par value	$ 1,000
Subsidiary debt	$ 989	0
6.75% Series, due 2031 | MEC
Debt Instrument [Line Items]
Stated rate	6.75%
Par value	$ 400
Subsidiary debt	$ 398	397
5.75% Series, due 2035 | MEC
Debt Instrument [Line Items]
Stated rate	5.75%
Par value	$ 300
Subsidiary debt	$ 299	298
5.80% Series, due 2036 | MEC
Debt Instrument [Line Items]
Stated rate	5.80%
Par value	$ 350
Subsidiary debt	348	348
Transmission upgrade obligation, 3.24% to 7.84%, due 2036 to 2043 | MEC
Debt Instrument [Line Items]
Par value	70
Subsidiary debt	$ 39	$ 27
Transmission upgrade obligation, 3.24% to 7.84%, due 2036 to 2043 | MEC | Minimum
Debt Instrument [Line Items]
Vendor financing, discount rate applied	3.24%
Transmission upgrade obligation, 3.24% to 7.84%, due 2036 to 2043 | MEC | Maximum
Debt Instrument [Line Items]
Vendor financing, discount rate applied	7.84%
Variable-rate tax-exempt bond obligation series: (weighted average interest rate- 2023-4.81%, 2022-3.83%): | MEC
Debt Instrument [Line Items]
Variable rate	4.81%	3.83%
Due 2023, issued in 1993 | MEC
Debt Instrument [Line Items]
Par value	$ 0
Subsidiary debt	0	$ 7
Due 2023, issued in 2008 | MEC
Debt Instrument [Line Items]
Par value	0
Subsidiary debt	0	57
Due 2024 | MEC
Debt Instrument [Line Items]
Par value	35
Subsidiary debt	35	35
Due 2025 | MEC
Debt Instrument [Line Items]
Par value	13
Subsidiary debt	13	13
Due 2036 | MEC
Debt Instrument [Line Items]
Par value	33
Subsidiary debt	33	33
Due 2038 | MEC
Debt Instrument [Line Items]
Par value	45
Subsidiary debt	45	45
Due 2046 | MEC
Debt Instrument [Line Items]
Par value	30
Subsidiary debt	29	30
Due 2047 | MEC
Debt Instrument [Line Items]
Par value	150
Subsidiary debt	$ 149	$ 149