Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 896	$ 1,150
Adjustments to reconcile net income to net cash flows from operating activities:
(Losses) gains on marketable securities, net	(596)	5
Depreciation and amortization	1,466	1,292
Allowance for equity funds	(45)	(35)
Equity income, net of distributions	1	(9)
Changes in regulatory assets and liabilities	206	21
Deferred income taxes and amortization of investment tax credits	(264)	341
Other, net	26	8
Changes in other operating assets and liabilities, net of effects from acquisitions:
Trade receivables and other assets	(226)	(73)
Derivative collateral, net	(5)	(13)
Pension and other postretirement benefit plans	(23)	(25)
Accrued property, income and other taxes, net	174	(244)
Accounts payable and other liabilities	16	20
Net cash flows from operating activities	2,818	2,428
Cash flows from investing activities:
Capital expenditures	(2,779)	(1,813)
Acquisitions, net of cash acquired		(588)
Purchases of marketable securities	209	122
Proceeds from sales of marketable securities	184	127
Equity method investments	(151)	(79)
Other, net	43	(6)
Net cash flows from investing activities	(3,019)	(2,481)
Cash flows from financing activities:
Proceeds from BHE senior debt	2,176	0
Repayments of BHE senior debt and junior subordinated debentures	(650)	(950)
Common stock purchases	(90)	(19)
Proceeds from subsidiary debt	1,313	1,163
Repayments of subsidiary debt	(1,082)	(668)
Net (repayments of) proceeds from short-term debt	(1,048)	617
Purchase of redeemable noncontrolling interest	(131)	0
Other, net	(23)	(31)
Net cash flows from financing activities	465	112
Effect of exchange rate changes	(3)	3
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect	261	62
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 1,544	$ 1,065