Other, Net - MidAmerican Funding (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 36	$ 39	$ 42
MidAmerican Funding, LLC and Subsidiaries [Domain]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	19	19	18
MidAmerican Funding, LLC and Subsidiaries [Domain] | Corporate Owned Life Insurance Income (Loss) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	8	4	8
MidAmerican Funding, LLC and Subsidiaries [Domain] | Available-For-Sale Securities, Gross Gain (Loss) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	5	0	0
MidAmerican Funding, LLC and Subsidiaries [Domain] | Gains (Losses) on Disposition of Assets [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	3	13	0
MidAmerican Funding, LLC and Subsidiaries [Domain] | Assets Leased to Others [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	0	1	5
MidAmerican Funding, LLC and Subsidiaries [Domain] | Other Income (Expense) [Member]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 3	$ 1	$ 5