Subsidiary Debt - MidAmerican Funding (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Par value	$ 49,746
Subsidiary debt
Debt Instrument [Line Items]
Par value	36,545
Subsidiary debt	36,659	$ 36,319
MidAmerican Funding LLC | Subsidiary debt
Debt Instrument [Line Items]
Par value	8,047
Subsidiary debt	7,946	7,431
MidAmerican Funding | Subsidiary debt
Debt Instrument [Line Items]
Par value	$ 8,047
MidAmerican Funding | Subsidiary debt | 6.927% Senior Bonds, due 2029
Debt Instrument [Line Items]
Stated rate	6.927%
Par value	$ 239
Subsidiary debt	225	221
MidAmerican Energy
Debt Instrument [Line Items]
Eligible property subject to lien of mortgages	$ 22,000
MidAmerican Energy | 3.65%, due 2029
Debt Instrument [Line Items]
Stated rate	3.65%
MidAmerican Energy | 4.25%, due 2049
Debt Instrument [Line Items]
Stated rate	4.25%
MidAmerican Energy | 3.15%, due 2050
Debt Instrument [Line Items]
Stated rate	3.15%
MidAmerican Energy | 2.70%, due 2052
Debt Instrument [Line Items]
Stated rate	2.70%
MidAmerican Energy | Subsidiary debt
Debt Instrument [Line Items]
Par value	$ 7,808
Subsidiary debt	$ 7,721	$ 7,210
MidAmerican Energy | Subsidiary debt | Variable-rate tax-exempt bond obligation series: (weighted average interest rate - 2021-0.13%, 2020-0.14%), due 2023-2047
Debt Instrument [Line Items]
Variable rate	0.13%	0.14%
Par value	$ 370
Subsidiary debt	$ 368	$ 368
MidAmerican Energy | Subsidiary debt | 3.70%, due 2023
Debt Instrument [Line Items]
Stated rate	3.70%
Par value	$ 250
Subsidiary debt	$ 250	249
MidAmerican Energy | Subsidiary debt | 3.50%, due 2024
Debt Instrument [Line Items]
Stated rate	3.50%
Par value	$ 500
Subsidiary debt	$ 501	501
MidAmerican Energy | Subsidiary debt | 3.10%, due 2027
Debt Instrument [Line Items]
Stated rate	3.10%
Par value	$ 375
Subsidiary debt	373	373
MidAmerican Energy | Subsidiary debt | 3.65%, due 2029
Debt Instrument [Line Items]
Par value	850
Subsidiary debt	$ 860	862
MidAmerican Energy | Subsidiary debt | 4.80%, due 2043
Debt Instrument [Line Items]
Stated rate	4.80%
Par value	$ 350
Subsidiary debt	$ 346	346
MidAmerican Energy | Subsidiary debt | 4.40%, due 2044
Debt Instrument [Line Items]
Stated rate	4.40%
Par value	$ 400
Subsidiary debt	$ 395	395
MidAmerican Energy | Subsidiary debt | 4.25%, due 2046
Debt Instrument [Line Items]
Stated rate	4.25%
Par value	$ 450
Subsidiary debt	$ 446	445
MidAmerican Energy | Subsidiary debt | 3.95%, due 2047
Debt Instrument [Line Items]
Stated rate	3.95%
Par value	$ 475
Subsidiary debt	$ 470	470
MidAmerican Energy | Subsidiary debt | 3.65%, due 2048
Debt Instrument [Line Items]
Stated rate	3.65%
Par value	$ 700
Subsidiary debt	689	689
MidAmerican Energy | Subsidiary debt | 4.25%, due 2049
Debt Instrument [Line Items]
Par value	900
Subsidiary debt	874	873
MidAmerican Energy | Subsidiary debt | 3.15%, due 2050
Debt Instrument [Line Items]
Par value	600
Subsidiary debt	592	592
MidAmerican Energy | Subsidiary debt | 2.70%, due 2052
Debt Instrument [Line Items]
Par value	500
Subsidiary debt	$ 492	0
MidAmerican Energy | Subsidiary debt | 6.75% Series, due 2031
Debt Instrument [Line Items]
Stated rate	6.75%
Par value	$ 400
Subsidiary debt	$ 397	397
MidAmerican Energy | Subsidiary debt | 5.75% Series, due 2035
Debt Instrument [Line Items]
Stated rate	5.75%
Par value	$ 300
Subsidiary debt	$ 298	298
MidAmerican Energy | Subsidiary debt | 5.80% Series, due 2036
Debt Instrument [Line Items]
Stated rate	5.80%
Par value	$ 350
Subsidiary debt	$ 348	$ 348
MidAmerican Energy | Subsidiary debt | Transmission upgrade obligation, 3.35% to 7.95%, due 2036 to 2041
Debt Instrument [Line Items]
Vendor financing, discount rate applied	3.35%	7.95%
Par value	$ 38
Subsidiary debt	22	$ 4
MidAmerican Energy | Subsidiary debt | Secured debt
Debt Instrument [Line Items]
Par value	$ 180