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Balance Sheet Components (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Allowance for Doubtful Accounts Receivable, Current | $ 7,000,000 | $ 6,000,000 | $ 6,000,000 | $ 5,000,000
Finite-Lived Intangible Assets, Accumulated Amortization | 176,000,000 |  | 170,000,000 |
Amortization of Intangible Assets | 6,000,000 | 5,000,000 |  |
Line of Credit Facility scheduled to terminate in 2017 | 400,000,000 |  |  |
Credit Facilities - $300 million revolver | 300,000,000 |  |  |
Debt Instrument, Covenant Description | .65 |  |  |
Ratio of Indebtedness to Net Capital | 0.508 |  |  |
Authorized Short-Term Debt | 900,000,000 |  |  |
Short-term Debt | 0 |  |  |
Commercial Paper | 0 |  |  |
Borrowings | 15,000,000 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 685,000,000 |  |  |
Line of Credit Facility, Current Borrowing Capacity | 30,000,000 |  |  |
Pledged Financial Instruments, Not Separately Reported, Securities for Letter of Credit Facilities | 45,000,000 |  |  |
letter of credit facility amount available | $ 15,000,000 |  |  |

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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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- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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