Long-term Debt - MEC (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Par value	$ 49,746
Maturity Schedule
2022	1,265
2023	3,225
2024	2,736
2025	2,540
2026	1,474
2027 and thereafter	38,506
MidAmerican Energy
Maturity Schedule
Eligible property subject to lien of mortgages	22,000
MEC
Debt Instrument [Line Items]
Par value	7,808
Subsidiary debt	7,721	$ 7,210
Maturity Schedule
2022	0
2023	316
2024	537
2025	15
2026	2
2027 and thereafter	$ 6,938
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	53.00%
MEC \| Dividend restriction for common equity commitment
Maturity Schedule
Amount available for dividend distribution	$ 3,300
3.70%, due 2023 \| MEC
Debt Instrument [Line Items]
Stated rate	3.70%
Par value	$ 250
Subsidiary debt	$ 250	249
3.50%, due 2024 \| MEC
Debt Instrument [Line Items]
Stated rate	3.50%
Par value	$ 500
Subsidiary debt	$ 501	501
3.10%, due 2027 \| MEC
Debt Instrument [Line Items]
Stated rate	3.10%
Par value	$ 375
Subsidiary debt	$ 373	373
3.65%, due 2029 \| MidAmerican Energy
Debt Instrument [Line Items]
Stated rate	3.65%
3.65%, due 2029 \| MEC
Debt Instrument [Line Items]
Stated rate	3.65%
Par value	$ 850
Subsidiary debt	$ 860	862
4.80%, due 2043 \| MEC
Debt Instrument [Line Items]
Stated rate	4.80%
Par value	$ 350
Subsidiary debt	$ 346	346
4.40%, due 2044 \| MEC
Debt Instrument [Line Items]
Stated rate	4.40%
Par value	$ 400
Subsidiary debt	$ 395	395
4.25%, due 2046 \| MEC
Debt Instrument [Line Items]
Stated rate	4.25%
Par value	$ 450
Subsidiary debt	$ 446	445
3.95%, due 2047 \| MEC
Debt Instrument [Line Items]
Stated rate	3.95%
Par value	$ 475
Subsidiary debt	$ 470	470
3.65%, due 2048 \| MEC
Debt Instrument [Line Items]
Stated rate	3.65%
Par value	$ 700
Subsidiary debt	$ 689	689
4.25%, due 2049 \| MidAmerican Energy
Debt Instrument [Line Items]
Stated rate	4.25%
4.25%, due 2049 \| MEC
Debt Instrument [Line Items]
Stated rate	4.25%
Par value	$ 900
Subsidiary debt	$ 874	873
3.15%, due 2050 \| MidAmerican Energy
Debt Instrument [Line Items]
Stated rate	3.15%
3.15%, due 2050 \| MEC
Debt Instrument [Line Items]
Stated rate	3.15%
Par value	$ 600
Subsidiary debt	$ 592	592
2.70%, due 2052 \| MidAmerican Energy
Debt Instrument [Line Items]
Stated rate	2.70%
2.70%, due 2052 \| MEC
Debt Instrument [Line Items]
Stated rate	2.70%
Par value	$ 500
Subsidiary debt	$ 492	0
6.75% Series, due 2031 \| MEC
Debt Instrument [Line Items]
Stated rate	6.75%
Par value	$ 400
Subsidiary debt	$ 397	397
5.75% Series, due 2035 \| MEC
Debt Instrument [Line Items]
Stated rate	5.75%
Par value	$ 300
Subsidiary debt	$ 298	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, 3.35% to 7.95%, due 2036 to 2041 \| MEC
Debt Instrument [Line Items]
Vendor financing, discount rate applied	7.95%	3.35%
Par value	$ 38
Subsidiary debt	$ 22	$ 4
Variable-rate tax-exempt bond obligation series: (weighted average interest rate- 2021-0.13%, 2020-0.14%): \| MEC
Debt Instrument [Line Items]
Variable rate	0.13%	0.14%
Due 2023, issued in 1993 \| MEC
Debt Instrument [Line Items]
Par value	$ 7
Subsidiary debt	7	$ 7
Due 2023, issued in 2008 \| MEC
Debt Instrument [Line Items]
Par value	57
Subsidiary debt	57	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	29
Due 2047 \| MEC
Debt Instrument [Line Items]
Par value	150
Subsidiary debt	$ 149	$ 149

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