Short-Term Debt and Credit Facilities - MEC - Credit Facility (Details) $ in Millions		Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	[1]	$ 9,412	$ 9,114
Short-term Debt	[1]	(3,214)	(2,516)
Line of Credit Facility, Amounts Supported	[1]	(629)	(543)
Line of Credit Facility, Remaining Borrowing Capacity	[1]	5,569	6,055
MidAmerican Energy Company [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		1,305	1,305
Short-term Debt		0	(240)
Line of Credit Facility, Amounts Supported		(370)	(370)
Line of Credit Facility, Remaining Borrowing Capacity		$ 935	$ 695
MidAmerican Energy Company [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt To Capitalization Ratio		0.65
MidAmerican Energy Company [Member] | Commercial Paper [Member]
Line of Credit Facility [Line Items]
Short-term Debt, Weighted Average Interest Rate, at Point in Time			2.49%
Regulatory Approval for Additional Short-Term Debt Issuances		$ 1,305
Short-term Debt			$ (240)
MidAmerican Energy Company [Member] | Unsecured credit facility, $900 million, expiring June 2022 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		900
MidAmerican Energy Company [Member] | Unsecured credit facility, $400 million, expiring August 2020 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		400
MidAmerican Energy Company [Member] | Unsecured 364-day Credit Facility, $5 million, expiring June [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 5
MidAmerican Energy Company [Member] | Unsecured credit facility, $400 million, expiring November 2019 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 400

[1] (1)The table does not include unused credit facilities and letters of credit for investments that are accounted for under the equity method.