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Balance Sheet Components Regulatory Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Current Regulatory Assets [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Price risk management | $ 39 | $ 26
Pension and other postretirement plans | 0 | 0
Deferred income taxes | 0 | 0
Debt issuance costs | 0 | 0
Other | 3 | 10
Total regulatory assets | 42 | 36
Noncurrent Regulatory Assets [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Price risk management | 150 | 120
Pension and other postretirement plans | 225 | 235
Deferred income taxes | 83 | 86
Debt issuance costs | 20 | 22
Other | 48 | 35
Total regulatory assets | 526 | 498
Current Regulatory Liabilities [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Asset retirement removal costs | 0 | 0
Trojan decommissioning activities | 4 | 18
Asset retirement obligations | 0 | 0
Other | 16 | 33
Total regulatory liabilities | 20 | 51
Noncurrent Regulatory Liabilities [Member] |  |
Regulatory Assets and Liabilities [Line Items] |  |
Asset retirement removal costs | 921 | 887
Trojan decommissioning activities | 0 | 0
Asset retirement obligations | 52 | 49
Other | 29 | 22
Total regulatory liabilities | $ 1,002 | $ 958

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived regulatory assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 + Details
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