Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income (Loss)	$ 1,348	$ (1,724)	$ (6,177)
Adjustments to reconcile net income (loss) to net cash from operating activities-
Gain on disposal, net of tax (Note 3)	(435)	0	0
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs	1,384	1,700	1,974
Impairment of assets and related charges	0	2,399	10,665
Pension trust contributions	(1,250)	0	(382)
Retirement benefits, net of payments	(137)	29	64
Pension and OPEB mark-to-market adjustment	144	141	147
Deferred income taxes and investment tax credits, net	485	839	(3,063)
Asset removal costs charged to income	42	22	54
Unrealized (gain) loss on derivative transactions	(5)	81	9
Gain on sale of investment securities held in trusts	(9)	(63)	(50)
Changes in current assets and liabilities-
Receivables	(248)	(39)	(11)
Materials and supplies	24	(6)	41
Prepaid taxes and other	(61)	30	27
Accounts payable	109	72	(37)
Accrued taxes	0	(9)	61
Accrued compensation and benefits	37	(27)	29
Other current liabilities	(146)	20	56
Cash collateral, net	(1)	27	(116)
Other	129	316	92
Net cash provided from operating activities	1,410	3,808	3,383
New Financing-
Long-term debt	1,474	4,675	1,976
Short-term borrowings, net	950	0	975
Preferred stock issuance	1,616	0	0
Common stock issuance	850	0	0
Redemptions and Repayments-
Long-term debt	(2,608)	(2,291)	(2,331)
Short-term borrowings, net	0	(2,375)	0
Tender premiums paid on debt redemptions	(89)	0	0
Preferred stock dividend payments	(61)	0	0
Common stock dividend payments	(711)	(639)	(611)
Other	(27)	(72)	(43)
Net cash provided from (used for) financing activities	1,394	(702)	(34)
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions	(2,675)	(2,587)	(2,835)
Nuclear fuel	0	(254)	(232)
Proceeds from asset sales	425	388	15
Sales of investment securities held in trusts	909	2,170	1,678
Purchases of investment securities held in trusts	(963)	(2,268)	(1,789)
Notes receivable from affiliated companies	(500)	0	0
Asset removal costs	(218)	(172)	(145)
Other	4	0	6
Net cash used for investing activities	(3,018)	(2,723)	(3,302)
Net change in cash, cash equivalents and restricted cash	(214)	383	47
Cash, cash equivalents, and restricted cash at beginning of period	643	260	213
Cash, cash equivalents, and restricted cash at end of period	429	643	260
SUPPLEMENTAL CASH FLOW INFORMATION:
Non-cash transaction: stock contribution to pension plan	0	0	500
Non-cash transaction: beneficial conversion feature (Note1)	296	0	0
Non-cash transaction: deemed dividend convertible preferred stock (Note 1)	(296)	0	0
Interest (net of amounts capitalized)	1,071	1,039	1,050
Income taxes, net of refunds	$ 49	$ 53	$ (16)