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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 320 $ 1,369
Adjustments to reconcile net income to net cash from operating activities-    
(Gain) loss on disposal, net of tax (Note 3) 24 (1,239)
Depreciation and amortization, including regulatory assets, net, intangible assets and deferred debt-related costs 345 280
Deferred income taxes and investment tax credits, net 91 278
Retirement benefits, net of payments (39) (46)
Pension trust contributions (500) (1,250)
Changes in current assets and liabilities-    
Receivables 92 32
Materials and supplies (12) 36
Prepaid taxes and other (148) (144)
Accounts payable (143) 96
Accrued taxes (81) (145)
Accrued compensation and benefits (123) (108)
Other current liabilities 0 (15)
Collateral, net (9) (7)
Other 1 (17)
Net cash used for operating activities (182) (880)
New Financing-    
Long-term debt 1,400 0
Short-term borrowings, net 50 900
Preferred stock issuance 0 1,616
Common stock issuance 0 850
Redemptions and Repayments-    
Long-term debt (628) (1,476)
Preferred stock dividend payments (3) (21)
Common stock dividend payments (201) (171)
Other (25) (19)
Net cash provided from financing activities 593 1,679
CASH FLOWS FROM INVESTING ACTIVITIES:    
Property additions (554) (583)
Proceeds from asset sales 0 20
Sales of investment securities held in trusts 153 300
Purchases of investment securities held in trusts (162) (322)
Notes receivable from affiliated companies 0 (500)
Asset removal costs (65) (57)
Other (2) (1)
Net cash used for investing activities (630) (1,143)
Net change in cash, cash equivalents, and restricted cash (219) (344)
Cash, cash equivalents, and restricted cash at beginning of period 429 643
Cash, cash equivalents, and restricted cash at end of period 210 299
SUPPLEMENTAL CASH FLOW INFORMATION:    
Non-cash transaction, beneficial conversion feature (Note 4) 0 296
Non-cash transaction, deemed dividend preferred stock (Note 4) $ 0 $ (113)