Discontinued Operations Discontinued Operations (Details) - Unregulated Retail Services [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
MidAmerican Funding, LLC and Subsidiaries [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, net assets and AOCI	$ 117
MidAmerican Energy Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, revenue	905	$ 918
Discontinued operations, costs of sales	854	863
Discontinued operations, cash flows from operations	30	$ (22)
Discontinued operations, accounts receivable, Net	115
Discontinued operations, derivative assets	41
Discontinued operations, deferred tax assets	21
Discontinued operations, accounts payable	(49)
Discontinued operations, derivative liabilities	(42)
Discontinued operations, other assets and liabilities, net	4
Discontinued operations, accumulated other comprehensive income loss, net	27
Discontinued operations, net assets and AOCI	$ (117)