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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 518 $ 563
Adjustments to reconcile net income to net cash flows from operating activities:    
Realized and unrealized (loss) gain on marketable securities, net (209)  
Realized and unrealized loss (gain) on marketable securities, net   (3)
Depreciation and amortization 716 622
Allowance for equity funds (21) (17)
Equity income, net of distributions (5) (13)
Changes in regulatory assets and liabilities 94 20
Deferred income taxes and amortization of investment tax credits (166) 224
Other, net 19 (2)
Changes in other operating assets and liabilities, net of effects from acquisitions:    
Trade receivables and other assets 250 308
Derivative collateral, net (14) (23)
Pension and other postretirement benefit plans (21) (17)
Accrued property, income and other taxes (60) (187)
Accounts payable and other liabilities (40) (37)
Net cash flows from operating activities 1,479 1,438
Cash flows from investing activities:    
Capital expenditures (1,075) (865)
Acquisitions, net of cash acquired 0 (579)
Purchases of marketable securities 155 81
Proceeds from sales of marketable securities 132 83
Equity method investments (156) (84)
Other, net 31 (12)
Net cash flows from investing activities (1,223) (1,538)
Cash flows from financing activities:    
Proceeds from Issuance of Unsecured Debt 2,176 0
Repayments of Long-term Debt 0 (200)
Common stock purchases (90) (19)
Proceeds from subsidiary debt 687 844
Repayments of subsidiary debt (550) (425)
Net (repayments of) proceeds from short-term debt (1,873) 140
Other, net (14) (12)
Net cash flows from financing activities 336 328
Effect of exchange rate changes 1 1
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect 593 229
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period 935  
Cash and cash equivalents and restricted cash and cash equivalents at end of period 1,644  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 1,876 $ 1,232