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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net Income (Loss) $ 912 $ 1,348 $ (1,724)
Adjustments to reconcile net income (loss) to net cash from operating activities-      
Gain on disposal, net of tax (Note 3) (59) (435) 0
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs 1,217 1,384 1,700
Impairment of assets and related charges 0 0 2,399
Pension trust contributions (500) (1,250) 0
Retirement benefits, net of payments (108) (137) 29
Pension and OPEB mark-to-market adjustment 676 144 141
Deferred income taxes and investment tax credits, net 252 485 839
Asset removal costs charged to income 28 42 22
Unrealized (gain) loss on derivative transactions 0 (5) 81
Gain on sale of investment securities held in trusts 0 (9) (63)
Changes in current assets and liabilities-      
Receivables 271 (248) (39)
Materials and supplies (37) 24 (6)
Prepaid taxes and other 10 (61) 30
Accounts payable (49) 109 72
Accrued taxes 12 0 (9)
Accrued interest 6 (25) 55
Accrued compensation and benefits (60) 37 (27)
Other current liabilities (21) (121) (35)
Other (83) 128 343
Net cash provided from operating activities 2,467 1,410 3,808
New financing-      
Long-term debt 2,300 1,474 4,675
Short-term borrowings, net 0 950 0
Preferred stock issuance 0 1,616 0
Common stock issuance 0 850 0
Redemptions and repayments-      
Long-term debt (789) (2,608) (2,291)
Short-term borrowings, net 0 0 (2,375)
Tender premiums paid on debt redemptions 0 (89) 0
Preferred stock dividend payments (6) (61) 0
Common stock dividend payments (814) (711) (639)
Other (35) (27) (72)
Net cash provided from (used for) financing activities 656 1,394 (702)
CASH FLOWS FROM INVESTING ACTIVITIES:      
Property additions (2,665) (2,675) (2,587)
Nuclear fuel 0 0 (254)
Proceeds from asset sales 47 425 388
Sales of investment securities held in trusts 1,637 909 2,170
Purchases of investment securities held in trusts (1,675) (963) (2,268)
Notes receivable from affiliated companies 0 (500) 0
Asset removal costs (217) (218) (172)
Other 0 4 0
Net cash used for investing activities (2,873) (3,018) (2,723)
Net change in cash, cash equivalents and restricted cash 250 (214) 383
Cash, cash equivalents, and restricted cash at beginning of period 429 643 260
Cash, cash equivalents, and restricted cash at end of period 679 429 643
SUPPLEMENTAL CASH FLOW INFORMATION:      
Non-cash transaction: beneficial conversion feature (Note1) 0 296 0
Non-cash transaction: deemed dividend convertible preferred stock (Note 1) 0 296 0
Interest (net of amounts capitalized) 960 1,071 1,039
Income taxes, net of refunds $ 12 $ 49 $ 53