Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income tax effect - unrecognized amounts on retirement benefits	$ 8	$ 9	$ 11
Income tax effect - unrealized gains (losses) on available-for-sale securities	0	270	(19)
Income tax effect - unrealized (losses) gains on cash flow hedges	1	(7)	13
MidAmerican Funding, LLC and Subsidiaries [Domain]
Income tax effect - unrealized gains (losses) on available-for-sale securities	0	0	1
MidAmerican Energy Company [Member]
Income tax effect - unrealized gains (losses) on available-for-sale securities	0	0	1
PacifiCorp [Member]
Income tax effect - unrecognized amounts on retirement benefits	$ (1)	$ (3)	$ 0

Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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