Subsidiary Debt - MidAmerican Funding (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Par value		$ 52,313
MEC
Debt Instrument [Line Items]
Par value		8,876
Subsidiary debt		$ 8,766	$ 7,729
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%
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
Subsidiary debt
Debt Instrument [Line Items]
Par value		39,012
Subsidiary debt		38,971	37,539
MidAmerican Funding LLC | Subsidiary debt
Debt Instrument [Line Items]
Par value		9,115
Subsidiary debt		8,992	7,954
MidAmerican Funding | Subsidiary debt
Debt Instrument [Line Items]
Par value		239
Fair value adjustments		(14)	(15)
Debt, net of fair value adjustments		$ 226	225
MidAmerican Funding | Subsidiary debt | 6.927% Senior Bonds, due 2029
Debt Instrument [Line Items]
Stated rate		6.927%
Par value		$ 239
Subsidiary debt		240	240
MidAmerican Energy
Debt Instrument [Line Items]
Eligible property subject to lien of mortgages		24,000
MidAmerican Energy | 5.35%, due 2053 | Subsequent event
Debt Instrument [Line Items]
Stated rate	5.30%
Par value	$ 600
Proceeds allocation period	24 months
MidAmerican Energy | Subsidiary debt
Debt Instrument [Line Items]
Par value		8,876
Subsidiary debt		$ 8,766	7,729
MidAmerican Energy | Subsidiary debt | 3.70%, due 2023
Debt Instrument [Line Items]
Stated rate		3.70%
Par value		$ 0
Subsidiary debt		$ 0	250
MidAmerican Energy | Subsidiary debt | 3.50%, due 2024
Debt Instrument [Line Items]
Stated rate		3.50%
Par value		$ 500
Subsidiary debt		$ 500	500
MidAmerican Energy | Subsidiary debt | 3.10%, due 2027
Debt Instrument [Line Items]
Stated rate		3.10%
Par value		$ 375
Subsidiary debt		$ 374	374
MidAmerican Energy | Subsidiary debt | 3.65%, due 2029
Debt Instrument [Line Items]
Stated rate		3.65%
Par value		$ 850
Subsidiary debt		$ 858	859
MidAmerican Energy | Subsidiary debt | 4.80%, due 2043
Debt Instrument [Line Items]
Stated rate		4.80%
Par value		$ 350
Subsidiary debt		$ 347	347
MidAmerican Energy | Subsidiary debt | 4.40%, due 2044
Debt Instrument [Line Items]
Stated rate		4.40%
Par value		$ 400
Subsidiary debt		$ 396	395
MidAmerican Energy | Subsidiary debt | 4.25%, due 2046
Debt Instrument [Line Items]
Stated rate		4.25%
Par value		$ 450
Subsidiary debt		$ 446	446
MidAmerican Energy | Subsidiary debt | 3.95%, due 2047
Debt Instrument [Line Items]
Stated rate		3.95%
Par value		$ 475
Subsidiary debt		$ 471	471
MidAmerican Energy | Subsidiary debt | 3.65%, due 2048
Debt Instrument [Line Items]
Stated rate		3.65%
Par value		$ 700
Subsidiary debt		$ 690	689
MidAmerican Energy | Subsidiary debt | 4.25%, due 2049
Debt Instrument [Line Items]
Stated rate		4.25%
Par value		$ 900
Subsidiary debt		$ 876	875
MidAmerican Energy | Subsidiary debt | 3.15%, due 2050
Debt Instrument [Line Items]
Stated rate		3.15%
Par value		$ 600
Subsidiary debt		$ 592	592
MidAmerican Energy | Subsidiary debt | 2.70%, due 2052
Debt Instrument [Line Items]
Stated rate		2.70%
Par value		$ 500
Subsidiary debt		$ 492	492
MidAmerican Energy | Subsidiary debt | 5.35%, due 2034
Debt Instrument [Line Items]
Stated rate		5.35%
Par value		$ 350
Subsidiary debt		$ 347	0
MidAmerican Energy | Subsidiary debt | 5.85%, due 2054
Debt Instrument [Line Items]
Stated rate		5.85%
Par value		$ 1,000
Subsidiary debt		$ 989	0
MidAmerican Energy | Subsidiary debt | 6.75% Series, due 2031
Debt Instrument [Line Items]
Stated rate		6.75%
Par value		$ 400
Subsidiary debt		$ 398	397
MidAmerican Energy | Subsidiary debt | 5.75% Series, due 2035
Debt Instrument [Line Items]
Stated rate		5.75%
Par value		$ 300
Subsidiary debt		$ 299	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, 3.24% to 7.84%, due 2036 to 2043
Debt Instrument [Line Items]
Par value		70
Subsidiary debt		$ 39	$ 27
MidAmerican Energy | Subsidiary debt | Transmission upgrade obligation, 3.24% to 7.84%, due 2036 to 2043 | Minimum
Debt Instrument [Line Items]
Vendor financing, discount rate applied		3.24%
MidAmerican Energy | Subsidiary debt | Transmission upgrade obligation, 3.24% to 7.84%, due 2036 to 2043 | Maximum
Debt Instrument [Line Items]
Vendor financing, discount rate applied		7.84%
MidAmerican Energy | Subsidiary debt | Variable-rate tax-exempt bond obligation series: (weighted average interest rate - 2023-4.81%, 2022-3.83%), due 2023-2047
Debt Instrument [Line Items]
Variable rate		4.81%	3.83%
Par value		$ 306
Subsidiary debt		$ 304	$ 369