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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Cash flows from operating activities: |  |
Net income | $ 58 | $ 48
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 75 | 62
Decrease in net liabilities from price risk management activities | (19) | (37)
Regulatory deferral - price risk management activities | 19 | 37
Deferred income taxes | 15 | 13
Pension and other postretirement benefits | 8 | 10
Allowance for equity funds used during construction | (6) | (2)
Regulatory deferral of settled derivative instruments | 5 | 5
Decoupling mechanism deferrals, net of amortization | 4 | 5
Other non-cash income and expenses, net | 7 | 8
Changes in working capital: |  |
Decrease in accounts receivable and unbilled revenues | 14 | 29
(Increase) decrease in margin deposits, net | (8) | 13
Decrease in accounts payable and accrued liabilities | (6) | (4)
Other working capital items, net | (13) | (12)
Cash received to be returned to customers pursuant to the Residential Exchange Program | 15 | 2
Other, net | (2) | (2)
Net cash provided by operating activities | 158 | 165
Cash flows from investing activities: |  |
Capital expenditures | (185) | (108)
Sales of nuclear decommissioning trust securities | 6 | 8
Purchases of nuclear decommissioning trust securities | (6) | (9)
Proceeds from sale of property | 4 | 0
Other, net | 2 | 2
Net cash used in investing activities | (179) | (107)
Cash flows from financing activities: |  |
Maturities of commercial paper, net | 0 | (17)
Dividends paid | (22) | (20)
Net cash used in financing activities | (22) | (37)
(Decrease) increase in cash and cash equivalents | (43) | 21
Cash and cash equivalents, beginning of period | 107 | 12
Cash and cash equivalents, end of period | 64 | 33
Supplemental cash flow information is as follows: |  |
Cash paid for interest, net of amounts capitalized | 10 | 13
Non-cash investing and financing activities: |  |
Accrued dividends payable | 22 | 20
Accrued capital additions | 69 | 11
Preliminary engineering costs transferred to Construction work-in-progress from Other noncurrent assets | $ 0 | $ 4

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- Definition The cash outflow due to repaying amounts borrowed by issuing commercial paper. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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