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Balance Sheet Components (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Nov. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Sep. 30, 2012 | Mar. 31, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable, Current |  |  |  | $ 5 |  | $ 6 |  | $ 5 | $ 6 | $ 5 | $ 6
Expenses related to Cascade Crossing |  |  |  | 0 |  | 0 |  | 52 | 0 |  |
Sale Leaseback Transaction, Construction Cost |  |  |  |  |  |  | 10 |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  |  |  | 167 |  |  |  | 167 |  | 151 |
Amortization of Intangible Assets |  |  |  | 5 |  | 5 |  | 16 | 17 |  |
Line of Credit Facility scheduled to terminate in 2017 |  |  |  | 400 |  |  |  | 400 |  |  |
Credit Facilities - $300 million revolver |  |  |  | 300 |  |  |  | 300 |  |  |
Debt Instrument, Covenant Description |  |  |  |  |  |  |  | .65 |  |  |
Ratio of Indebtedness to Net Capital |  |  |  | 0.496 |  |  |  | 0.496 |  |  |
Line of Credit Facility, Current Borrowing Capacity | 60.0 |  | 60.0 | 51.5 |  |  |  | 51.5 |  |  |
letter of credit facility | 30.0 |  | 30.0 | 21.5 |  |  |  | 21.5 |  |  |
Authorized Short-Term Debt |  |  |  | 700 |  |  |  | 700 |  |  |
Borrowings |  |  |  | 0 |  |  |  | 0 |  |  |
Letters of Credit Issued |  |  |  | 56 |  |  |  | 56 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | 696 |  |  |  | 696 |  |  |
Commercial Paper |  |  |  | 0 |  |  |  | 0 |  |  |
Repayments of Long-term Debt |  |  |  | 50 | 50 |  |  | 100 | 0 |  |
Proceeds from Issuance of Long-term Debt | $ 50 | $ 105 | $ 155 | $ 75 | $ 150 |  |  | $ 225 | $ 0 |  |

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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