Schedule I MidAmerican Funding, LLC Condensed Financial Statements Condensed Balance Sheets (Details) (MidAmerican Funding LLC [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
MidAmerican Funding LLC [Member]
Current assets:
Receivables from affiliates	$ 3	$ 2
Investments in and advances to subsidiaries	4,903	4,539
Total assets	4,906	4,541
Current liabilities:
Interest accrued and other current liabilities	8	8
Payable to affiliate	248	235
Long-term debt	325	325
Other	1	1
Total liabilities	582	569
Member's equity:
Paid-in capital	1,679	1,679
Retained earnings	2,669	2,327
Accumulated other comprehensive loss, net	(24)	(34)
MidAmerican Funding member's equity	4,324	3,972
Total capitalization and liabilities	$ 4,906	$ 4,541