Other, Net - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 88	$ 97	$ (9)
MidAmerican Energy Company [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	52	50	30
MidAmerican Energy Company [Member] | Defined Benefit Retirement Plans, Non-service Cost Components [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	24	17	21
MidAmerican Energy Company [Member] | Corporate Owned Life Insurance Income (Loss) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	16	24	6
MidAmerican Energy Company [Member] | Gains (Losses) on Disposition of Assets [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	6	0	0
MidAmerican Energy Company [Member] | Interest Income and Other Net [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 6	$ 9	$ 3