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Balance Sheet Components (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Sep. 30, 2013 | 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
Finite-Lived Intangible Assets, Accumulated Amortization |  | 162 |  |  | 162 |  |  | 151 |
Amortization of Intangible Assets |  | 6 | 6 |  | 11 | 11 |  |  |
Sale Leaseback Transaction, Construction Cost |  |  |  | 10 |  |  |  |  |
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 |  |  |  |
letter of credit facility |  | 21.5 |  |  | 21.5 |  |  |  |
Authorized Short-Term Debt |  | 700 |  |  | 700 |  |  |  |
Borrowings |  | 0 |  |  | 0 |  |  |  |
Letters of Credit Issued |  | 54 |  |  | 54 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | 668 |  |  | 668 |  |  |  |
Commercial Paper |  | 0 |  |  | 0 |  |  |  |
Repayments of Long-term Debt |  | 50 |  |  | 50 | 0 |  |  |
Proceeds from Issuance of Long-term Debt | $ 75 | $ 150 |  |  | $ 150 | $ 0 | $ 225 |  |

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