Consolidated Statements of Cash Flows (LLC) (MidAmerican Funding, LLC and Subsidiaries [Domain], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
MidAmerican Funding, LLC and Subsidiaries [Domain]
Cash flows from operating activities:
Net income	$ 409	$ 341	$ 343
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	351	403	392
Deferred income taxes and amortization of investment tax credits	298	102	175
Changes in other assets and liabilities	47	57	49
Other, net	(49)	(29)	(22)
Changes in other operating assets and liabilities:
Receivables, net	(2)	(60)	(13)
Inventories	44	13	(40)
Derivative collateral, net	(53)	5	4
Contributions to pension and other postretirement benefit plans, net	(2)	8	(53)
Accounts payable	30	23	12
Taxes accrued, net	(253)	(164)	419
Other current assets and liabilities	0	22	(6)
Net cash flows from operating activities	820	721	1,260
Net cash flows from investing activities:
Utility construction expenditures	(1,526)	(1,026)	(645)
Purchases of available-for-sale securities	(88)	(114)	(64)
Proceeds from sales of available-for-sale securities	80	102	45
Proceeds from sales of other investments	10	16	8
Other, net	5	10	18
Net cash flows from investing activities	(1,519)	(1,012)	(638)
Net cash flows from financing activities:
Proceeds from long-term debt	847	947	0
Repayments of long-term debt	(356)	(670)	(283)
Redemption of preferred securities of subsidiary	0	(28)	0
Net change in note payable to affiliate	1	(111)	15
Net proceeds from short-term debt	50	0	0
Other, net	(7)	(7)	(1)
Net cash flows from financing activities	535	131	(269)
Net change in cash and cash equivalents	(164)	(160)	353
Cash and cash equivalents at beginning of year	194	354	1
Cash and cash equivalents at end of year	$ 30	$ 194	$ 354