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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
NET INCOME $ 1,668 $ 379
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 604 829
Deferred income taxes and investment tax credits, net 327 224
Impairment of assets and related charges 0 131
Retirement benefits, net of payments (97) 17
Pension trust contributions (1,250) 0
Unrealized (gain) loss on derivative transactions (10) 53
Changes in current assets and liabilities-    
Receivables 20 83
Materials and supplies 28 (10)
Prepaid taxes and other (143) (127)
Accounts payable 50 0
Accrued taxes (58) (62)
Accrued compensation and benefits (76) (125)
Other current liabilities (152) (55)
Collateral, net (15) 32
Other 55 113
Net cash provided from (used for) operating activities (288) 1,482
New Financing-    
Long-term debt 450 3,500
Short-term borrowings, net 1,364 0
Preferred stock issuance 1,616 0
Common stock issuance 850 0
Redemptions and Repayments-    
Long-term debt (2,251) (735)
Short-term borrowings, net 0 (2,450)
Make-whole premiums paid on debt redemptions (89) 0
Preferred stock dividend payments (42) 0
Common stock dividend payments (343) (319)
Other (21) (52)
Net cash provided from (used for) financing activities 1,534 (56)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Property additions (1,307) (1,254)
Nuclear fuel 0 (134)
Proceeds from asset sales 390 0
Sales of investment securities held in trusts 475 1,257
Purchases of investment securities held in trusts (508) (1,305)
Notes receivable from affiliated companies (500) 0
Asset removal costs (118) (79)
Other 3 0
Net cash used for investing activities (1,565) (1,515)
Net change in cash and cash equivalents and restricted cash (319) (89)
Cash, cash equivalents and restricted cash at beginning of period 643 260
Cash, cash equivalents and restricted cash at end of period 324 171
SUPPLEMENTAL CASH FLOW INFORMATION:    
Non-cash transaction, beneficial conversion feature (Note 4) 296 0
Non-cash transaction, deemed dividend preferred stock (Note 4) $ (261) $ 0