Other, Net - MidAmerican Funding (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 39	$ 42	$ 51
MidAmerican Funding, LLC and Subsidiaries [Domain]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	19	18	22
Corporate Owned Life Insurance Income (Loss) [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	4	8	15
Gains (Losses) on Disposition of Assets [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	13	0	1
Assets Leased to Others [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	1	5	2
Other Income (Expense) [Member] | MidAmerican Funding, LLC and Subsidiaries [Domain]
Component of Other Income (Expense), Nonoperating [Line Items]
Other, net	$ 1	$ 5	$ 4