Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income $ 367 $ 377
Adjustments to reconcile to net cash flows provided by operating activities:    
Depreciation and amortization 350 327
Deferred income taxes and amortization of investment tax credits 223 236
Provision for losses on accounts receivable 18 22
Gain on asset dispositions and purchases (8) (2)
Pension and non-pension postretirement benefits 43 46
Other non-cash, net (48) (40)
Changes in assets and liabilities:    
Receivables and unbilled revenues (83) (147)
Pension and non-pension postretirement benefit contributions (42) (40)
Accounts payable and accrued liabilities 184 69
Other assets and liabilities, net (79) 8
Net cash provided by operating activities 925 856
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures (928) (791)
Acquisitions (29) (176)
Proceeds from sale of assets and securities 5 5
Removal costs from property, plant and equipment retirements, net (62) (74)
Net funds restricted   (9)
Net cash used in investing activities (1,014) (1,045)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from long-term debt 2 564
Repayments of long-term debt (20) (88)
Proceeds from short-term borrowings with maturities greater than three months   60
Repayments of short-term borrowings with maturities greater than three months   (60)
Net short-term borrowings with maturities less than three months 322 (70)
Proceeds from issuances of employee stock plans and DRIP 22 32
Advances and contributions for construction, net of refunds of $17 and $17, respectively 16 20
Debt issuance costs (1) (7)
Dividends paid (194) (178)
Anti-dilutive stock repurchase (65) (39)
Tax benefit realized from equity compensation 8 7
Net cash provided by financing activities 90 241
Net increase in cash and cash equivalents 1 52
Cash and cash equivalents as of beginning of period 45 23
Cash and cash equivalents as of end of period 46 75
Non-cash investing activity:    
Capital expenditures acquired on account but unpaid as of end of period $ 182 $ 195