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Fair Value of Financial Instruments Financial Assets and Liabilities Recognized at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Nuclear decommissioning trust: (1) |  |
Money market funds | $ 17 | $ 65
Debt securities: |  |
Domestic government | 13 | 14
Corporate credit | 10 | 11
Equity securities: |  |
Domestic | 6 | 5
International |  | 1
Debt securities—domestic government | 1 |
Assets from price risk management activities: (1) (3) |  |
Electricity | 5 | 5
Natural gas | 2 | 2
Total | 54 | 103
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 148 | 112
Natural gas | 151 | 116
Total | 299 | 228
Fair Value, Inputs, Level 1 [Member] |  |
Nuclear decommissioning trust: (1) |  |
Money market funds | 0 | 0
Debt securities: |  |
Domestic government | 5 | 7
Corporate credit | 0 | 0
Equity securities: |  |
Domestic | 4 | 4
International |  | 1
Debt securities—domestic government | 1 |
Assets from price risk management activities: (1) (3) |  |
Electricity | 0 | 0
Natural gas | 0 | 0
Total | 10 | 12
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 0 | 0
Natural gas | 0 | 0
Total | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Nuclear decommissioning trust: (1) |  |
Money market funds | 17 | 65
Debt securities: |  |
Domestic government | 8 | 7
Corporate credit | 10 | 11
Equity securities: |  |
Domestic | 2 | 1
International |  | 0
Debt securities—domestic government | 0 |
Assets from price risk management activities: (1) (3) |  |
Electricity | 5 | 4
Natural gas | 2 | 2
Total | 44 | 90
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 31 | 32
Natural gas | 99 | 95
Total | 130 | 127
Fair Value, Inputs, Level 3 [Member] |  |
Nuclear decommissioning trust: (1) |  |
Money market funds | 0 | 0
Debt securities: |  |
Domestic government | 0 | 0
Corporate credit | 0 | 0
Equity securities: |  |
Domestic | 0 | 0
International |  | 0
Debt securities—domestic government | 0 |
Assets from price risk management activities: (1) (3) |  |
Electricity | 0 | 1
Natural gas | 0 | 0
Total | 0 | 1
Liabilities from price risk management activities: (1) (3) |  |
Electricity | 117 | 80
Natural gas | 52 | 21
Total | $ 169 | $ 101

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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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