Consolidated Balance Sheets Balance Sheets (Parenthetical) - MEC - USD ($) shares in Millions, $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Common Stock, No Par Value	$ 0
Common Stock, Shares Authorized	115
Common Stock, Shares, Issued	76
Common Stock, Shares, Outstanding	76
Accrued property, income and other taxes	$ 515	$ 582
Short-term debt	$ 2,699	2,286
MidAmerican Energy Company [Member]
Common Stock, No Par Value	$ 0
Common Stock, Shares Authorized	350
Common Stock, Shares, Issued	71
Common Stock, Shares, Outstanding	71
Accrued property, income and other taxes	$ 124	161
Short-term debt	$ 387	$ 0