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Condensed Statements of Consolidated Cash Flows (Unaudited) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash Flows from Operating Activities:    
Net income $ 208 $ 292
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 456 491
Amortization of deferred financing costs 14 14
Deferred income taxes 4 13
Unrealized gain on marketable securities 62 42
Loss on indexed debt securities (67) (7)
Write-down of natural gas inventory 2 0
Equity in earnings of unconsolidated affiliates, net of distributions 50 2
Pension contributions (25) (34)
Changes in other assets and liabilities:    
Accounts receivable and unbilled revenues, net 367 211
Inventory 103 (10)
Taxes receivable 152 0
Accounts payable (327) (174)
Fuel cost recovery 86 (42)
Non-trading derivatives, net 2 (11)
Margin deposits, net 25 (2)
Interest and taxes accrued (66) (44)
Net regulatory assets and liabilities 78 46
Other current assets 23 17
Other current liabilities (38) (50)
Other assets 0 8
Other liabilities (3) 21
Other, net 6 (1)
Net cash provided by operating activities 1,122 712
Cash Flows from Investing Activities:    
Capital expenditures (712) (625)
Decrease (increase) in restricted cash of transition and system restoration bond companies 13 (10)
Proceeds from sale of marketable securities 0 (1)
Proceeds from sale of marketable securities 32 0
Other, net (4) (23)
Net cash used in investing activities (671) (659)
Cash Flows from Financing Activities:    
Decrease in short-term borrowings, net (29) (1)
Proceeds (payments) of commercial paper, net 137 (77)
Proceeds from long-term debt 0 600
Payments of long-term debt (400) (373)
Debt issuance costs 0 (6)
Payment of common stock dividends (213) (204)
Other, net 1 6
Net cash used in financing activities (504) (55)
Net Decrease in Cash and Cash Equivalents (53) (2)
Cash and Cash Equivalents at Beginning of Period 298 208
Cash and Cash Equivalents at End of Period 245 206
Cash Payments:    
Interest, net of capitalized interest 209 203
Income tax payments (refunds), net (38) 140
Non-cash transactions:    
Accounts payable related to capital expenditures 81 78
Exercise of SESH put to Enable $ 1 $ 0