Other, Net - MEC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ (9)	$ (420)	$ 30
MidAmerican Energy Company [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	30	37	29
MidAmerican Energy Company [Member] | Defined Benefit Retirement Plans, Non-service Cost Components [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	21	18	15
MidAmerican Energy Company [Member] | Corporate Owned Life Insurance Income (Loss) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	6	13	8
MidAmerican Energy Company [Member] | Available-For-Sale Securities, Gross Gain (Loss) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	0	0	5
MidAmerican Energy Company [Member] | Other Income (Expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 3	$ 6	$ 1