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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net income $ 131 $ 57
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 224 186
Cascade Crossing transmission project 0 52
Decrease in net liabilities from price risk management activities (60) (35)
Regulatory deferral - price risk management activities 60 35
Deferred income taxes 31 (2)
Pension and other postretirement benefits 25 28
Allowance for equity funds used during construction (26) (8)
Regulatory deferral of settled derivative instruments 9 13
Decoupling mechanism deferrals, net of amortization (4) 5
Other non-cash income and expenses, net 18 14
Changes in working capital:    
Decrease in accounts receivable and unbilled revenues 32 47
Decrease in margin deposits, net 4 10
Increase in accounts payable and accrued liabilities 18 13
Other working capital items, net (2) 24
Cash received to be returned to customers pursuant to the Residential Exchange Program 13 0
Proceeds received from Trojan spent fuel legal settlement 6 44
Other, net (14) (14)
Net cash provided by operating activities 473 459
Cash flows from investing activities:    
Capital expenditures (824) (453)
Contribution to nuclear decommissioning trust (6) (44)
Sales of nuclear decommissioning trust securities 13 20
Purchases of nuclear decommissioning trust securities (15) (21)
Proceeds received from insurance recovery 3 3
Proceeds from sale of property 4 0
Other, net 4 4
Net cash used in investing activities (821) (491)
Cash flows from financing activities:    
Proceeds from issuance of long-term debt 405 225
Payments on long-term debt 0 100
Proceeds from issuance of common stock, net of issuance costs 0 67
Borrowings on short-term debt 0 35
Payments on short-term debt 0 35
Maturities of commercial paper, net 0 (17)
Dividends paid (66) (62)
Debt issuance costs (1) (2)
Net cash provided by financing activities 338 111
Change in cash and cash equivalents (10) 79
Cash and cash equivalents, beginning of period 107 12
Cash and cash equivalents, end of period 97 91
Supplemental cash flow information is as follows:    
Cash paid for interest, net of amounts capitalized 52 57
Cash paid for income taxes 16 9
Non-cash investing and financing activities:    
Accrued capital additions 76 23
Accrued dividends payable 23 22
Preliminary engineering costs transferred to Construction work-in-progress from Other noncurrent assets $ 0 $ 9