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Balance Sheet Components (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Oct. 22, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Transfers Between Measurement Levels | $ 1 | $ 0 | $ 0 |  |  |  |
Long Term Debt, Repayment |  |  |  |  | 100 |  |
Allowance for Doubtful Accounts Receivable, Current | 6 | 5 | 6 | 5 |  | 6 | 5
Finite-Lived Intangible Assets, Accumulated Amortization | 169 |  | 169 |  |  | 153 |
Amortization of Intangible Assets | 5 | 5 | 17 | 14 |  |  |
Sale Leaseback Transaction, Construction Cost |  |  | 10 |  |  |  |
Portion of $370 million credit facility scheduled to terminate in July 2013 | 360 |  | 360 |  |  |  |
Credit Facilities - $300 million revolver | 300 |  | 300 |  |  |  |
Debt Instrument, Covenant Description |  |  | 0.650 |  |  |  |
Ratio of Indebtedness to Net Capital | 0.503 |  | 0.503 |  |  |  |
Authorized Short-Term Debt | 700 |  | 700 |  |  |  |
Borrowings | 0 |  | 0 |  |  |  |
Letters of Credit Issued | 61 |  | 61 |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 599 |  | $ 599 |  |  |  |

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- Definition Credit Facilities - $300 million revolver + References No definition available. + Details
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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 FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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