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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 2,087 $ 1,924
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 1,922 1,814
Allowance for equity funds (147) (84)
Equity income, net of distributions (62) (38)
Increase (Decrease) in Regulatory Assets and Liabilities 41 326
Deferred income taxes and amortization of investment tax credits 546 617
Other, net (60) 41
Changes in other operating assets and liabilities, net of effects from acquisitions:    
Increase (Decrease) in Accounts Receivable and Other Operating Assets (348) (251)
Derivative collateral, net 22 8
Pension and other postretirement benefit plans (73) (9)
Accrued property, income and other taxes 713 1,608
Accounts payable and other liabilities 183 (47)
Net cash flows from operating activities 4,824 5,909
Cash flows from investing activities:    
Capital expenditures (3,521) (4,251)
Acquisitions, net of cash acquired (66) (157)
Increase in restricted cash and investments (48) (64)
Purchases of available-for-sale securities (98) (132)
Proceeds from sales of available-for-sale securities 125 123
Equity method investments (462) (32)
Other, net (47) 67
Net cash flows from investing activities (4,117) (4,446)
Cash flows from financing activities:    
Repayments of Subordinated Debt 1,500 600
Common stock purchases 0 (36)
Proceeds from subsidiary debt 1,484 1,468
Repayments of subsidiary debt (1,613) (712)
Net proceeds from (repayments of) short-term debt 887 (473)
Other, net (50) (75)
Net cash flows from financing activities (792) (428)
Effect of exchange rate changes (5) (1)
Net change in cash and cash equivalents (90) 1,034
Cash and cash equivalents at beginning of period 1,108 617
Cash and cash equivalents at end of period $ 1,018 $ 1,651