Revenue from Contracts with Customers - LLC (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 5,138	$ 4,357	$ 14,049	$ 11,190
Nonregulated \| Nonregulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	708	430	1,938	1,081
Other \| MidAmerican Funding, LLC \| Nonregulated \| Nonregulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 0	$ 0	$ 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