Revenue from Contracts with Customers - LLC (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 4,199	$ 3,317	$ 8,911	$ 6,833
Nonregulated \| Nonregulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	612	348	1,230	651
Other \| MidAmerican Funding, LLC \| Nonregulated \| Nonregulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 0	$ 3	$ 0	$ 8

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details