Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 1,369	$ 205
Adjustments to reconcile net income to net cash from operating activities-
Gain on deconsolidation, net of tax (Note 3)	(1,239)	0
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs	280	416
Deferred income taxes and investment tax credits, net	278	114
Retirement benefits, net of payments	(46)	10
Pension trust contributions	(1,250)	0
Unrealized (gain) loss on derivative transactions	(10)	47
Changes in current assets and liabilities-
Receivables	32	68
Materials and supplies	36	11
Prepaid taxes and other	(144)	(111)
Accounts payable	96	45
Accrued taxes	(145)	(131)
Accrued compensation and benefits	(108)	(137)
Other current liabilities	(15)	20
Collateral, net	(7)	58
Other	(7)	170
Net cash provided from (used for) operating activities	(880)	785
New Financing-
Long-term debt	0	250
Short-term borrowings, net	900	75
Preferred stock issuance	1,616	0
Common stock issuance	850	0
Redemptions and Repayments-
Long-term debt	(1,476)	(211)
Preferred stock dividend payments	(21)	0
Common stock dividend payments	(171)	(159)
Other	(19)	(13)
Net cash provided from (used for) financing activities	1,679	(58)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(583)	(588)
Nuclear fuel	0	(132)
Proceeds from asset sales	20	0
Sales of investment securities held in trusts	300	738
Purchases of investment securities held in trusts	(322)	(761)
Notes receivable from affiliated companies	(500)	0
Asset removal costs	(57)	(35)
Other	(1)	(1)
Net cash used for investing activites	(1,143)	(779)
Net change in cash and cash equivalents and restricted cash	(344)	(52)
Cash and cash equivalents and restricted cash at beginning of period	643	260
Cash and cash equivalents and restricted cash at end of period	299	208
SUPPLEMENTAL CASH FLOW INFORMATION:
Non-cash transaction, beneficial conversion feature (Note 4)	296	0
Non-cash transaction, deemed dividend preferred stock (Note 4)	$ (113)	$ 0