Schedule I Condensed Financial Statements (Parent Company Only) - Condensed Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	$ 8,692	$ 6,224	$ 6,206
Cash flows from investing activities:
Purchases of marketable securities	(297)	(370)	(262)
Proceeds from sales of marketable securities	273	325	238
Purchases of other investments	(20)	(1,323)	0
Proceeds from other investments	1,300	13	18
Other, net	(74)	76	51
Net cash flows from investing activities	(5,763)	(13,165)	(8,963)
Cash flows from financing activities:
Proceeds from issuance of preferred stock	0	3,750	0
Preferred stock redemptions	(2,100)	0	0
Preferred dividends	(132)	(7)	0
Common stock purchases	0	(126)	(293)
Net (repayments of) proceeds from short-term debt	(276)	(939)	684
Other, net	(79)	(134)	(37)
Net cash flows from financing activities	(3,131)	7,103	3,124
Net change in cash and cash equivalents and restricted cash and cash equivalents	(201)	177	385
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	1,445	1,268	883
Cash and cash equivalents and restricted cash and cash equivalents at end of period	1,244	1,445	1,268
MidAmerican Funding LLC
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	(12)	(12)	(12)
Cash flows from investing activities:
Net cash flows from investing activities	0	0	0
Cash flows from financing activities:
Net change in amounts payable to subsidiary	12	12	12
Net cash flows from financing activities	12	12	12
Net change in cash and cash equivalents and restricted cash and cash equivalents	0	0	0
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents and restricted cash and cash equivalents at end of period	0	0	0
Parent Company
Condensed Financial Statements, Captions [Line Items]
Cash flows from operating activities	1,819	1,639	1,780
Cash flows from investing activities:
Investments in subsidiaries	(1,206)	(6,422)	(1,972)
Purchases of marketable securities	(29)	(55)	(42)
Proceeds from sales of marketable securities	28	22	41
Purchases of other investments	0	(1,290)	0
Proceeds from other investments	1,290	0	1
Notes receivable from affiliate, net	200	(121)	(112)
Other, net	(20)	(20)	(5)
Net cash flows from investing activities	263	(7,886)	(2,089)
Cash flows from financing activities:
Proceeds from issuance of preferred stock	0	3,750	0
Preferred stock redemptions	(2,100)	0	0
Preferred dividends	(132)	(7)	0
Common stock purchases	0	(126)	(293)
Proceeds from BHE senior debt	0	5,212	0
Repayments of BHE senior debt	(450)	(350)	0
Net (repayments of) proceeds from short-term debt	0	(1,590)	607
Other, net	(5)	(32)	(1)
Net cash flows from financing activities	(2,687)	6,857	313
Net change in cash and cash equivalents and restricted cash and cash equivalents	(605)	610	4
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	623	13	9
Cash and cash equivalents and restricted cash and cash equivalents at end of period	$ 18	$ 623	$ 13