Commitments and Contingencies Commitments and Contingencies - MEC- Commitments (Details) - MidAmerican Energy Company [Member] $ in Millions	Sep. 30, 2019 USD ($)
Capital Addition Purchase Commitments [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	$ 337
Maintenance, service and other contracts [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Purchase Obligation	377
Easements [Member]
ContractualObligationFiscalYearMaturityScheduleTable [Line Items]
Operating Leases, Future Minimum Payments Due	$ 341

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant