Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	0
MidAmerican Energy Company [Member]
Income tax effect - unrealized gains (losses) on available-for-sale securities	0	0	0
PacifiCorp [Member]
Income tax effect - unrecognized amounts on retirement benefits	$ (1)	$ 1	$ 3