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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income $ 802 $ 882
Adjustments to reconcile to net cash provided by operating activities:    
Depreciation, decommissioning and amortization 1,187 1,058
Regulatory impacts of net nuclear decommissioning trust earnings 147 131
Other amortization 55 97
Stock-based compensation 13 12
Deferred income taxes and investment tax credits 426 526
Proceeds from U.S. treasury grants 29 0
Changes in operating assets and liabilities:    
Receivables (336) (253)
Inventory 13 (8)
Margin and collateral deposits - net of collateral received 6 (9)
Prepaid taxes 230 48
Other current assets (295) (280)
Accounts payable 165 142
Accrued taxes 49 77
Other current liabilities (120) (230)
Derivative assets and liabilities - net 63 433
Regulatory assets and liabilities - net 147 (363)
Other assets (26) (21)
Other liabilities 101 30
Net cash provided by operating activities 2,656 2,272
Cash flows from financing activities:    
Long-term debt issued 395 497
Long-term debt issuance costs (4) (5)
Long-term debt repaid (4) (12)
Bonds purchased 0 (86)
Preferred stock issued - net 804 123
Preference stock redeemed (75) 0
Short-term debt financing - net (45) 550
Settlements of stock-based compensation - net (24) (7)
Dividends paid (411) (388)
Net cash provided by financing activities 636 672
Cash flows from investing activities:    
Capital expenditures (3,105) (3,014)
Proceeds from sale of nuclear decommissioning trust investments 1,525 2,108
Purchases of nuclear decommissioning trust investments and other (1,689) (2,254)
Customer advances for construction and other investments 10 24
Net cash used by investing activities (3,259) (3,136)
Net increase (decrease) in cash and cash equivalents 33 (192)
Cash and cash equivalents, beginning of period 57 257
Cash and cash equivalents, end of period $ 90 $ 65