Statements of Cash Flows - MEC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net Income (Loss) Attributable to Parent	$ 2,198	$ 2,062
Deferred income taxes and amortization of investment tax credits	573	546
Other Noncash Income (Expense)	13	(60)
Derivative collateral, net	(16)	22
Pension and other postretirement benefit plans	(29)	(73)
Accrued property, income and other taxes	390	713
Net cash flows from operating activities	5,118	4,824
Capital expenditures	(3,179)	(3,521)
Purchases of available-for-sale securities	(167)	(98)
Proceeds from sales of available-for-sale securities	186	125
Other, net	(12)	(47)
Net cash flows from investing activities	(4,373)	(4,117)
Proceeds from Issuance of Long-term Debt	91	0
Repayments of Long-term Debt	(1,344)	(1,500)
Net proceeds from short-term debt	365	887
Other, net	(60)	(50)
Net cash flows from financing activities	(330)	(792)
Net change in cash and cash equivalents	421	(90)
Cash and cash equivalents at beginning of period	721	1,108
Cash and cash equivalents at end of period	1,142	1,018
MidAmerican Energy Company [Member]
Net Income (Loss) Attributable to Parent	624	527
Utilities Operating Expense, Depreciation and Amortization	369	338
Deferred income taxes and amortization of investment tax credits	64	113
Increase (Decrease) in Other Noncurrent Assets and Liabilities, Net	28	34
Other Noncash Income (Expense)	(23)	(42)
Increase (Decrease) in Accounts and Other Receivables	(28)	(67)
Increase (Decrease) in Inventories	29	(26)
Derivative collateral, net	3	4
Pension and other postretirement benefit plans	(8)	(5)
Increase (Decrease) in Accounts Payable	(5)	14
Accrued property, income and other taxes	98	160
Increase (Decrease) in Other Current Assets and Liabilities, Net	20	30
Net cash flows from operating activities	1,171	1,080
Capital expenditures	(1,162)	(1,129)
Purchases of available-for-sale securities	(126)	(96)
Proceeds from sales of available-for-sale securities	127	92
Other, net	0	5
Net cash flows from investing activities	(1,161)	(1,128)
Proceeds from Issuance of Long-term Debt	842	33
Repayments of Long-term Debt	(255)	(38)
Net proceeds from short-term debt	(99)	0
Net cash flows from financing activities	488	(5)
Net change in cash and cash equivalents	498	(53)
Cash and cash equivalents at beginning of period	14	103
Cash and cash equivalents at end of period	$ 512	$ 50