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Commercial Paper Program (Details) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Line of Credit Facility [Line Items] |  |  |  |
Size of total commercial paper program | $ 1,200,000,000 | $ 1,200,000,000 |  |
Commitment fee |  | 15 to 35 basis points, depending on credit rating and currently pay a commitment fee of 20 basis points |  |
Commitment fee, minimum percentage to pay depending on credit rating |  | 0.15% |  |
Commitment fee, maximum percentage to pay depending on credit rating |  | 0.35% |  |
Special dividend (in usd per share) | $ 2.50 | $ 1.02 | $ 1.00 | $ 0.94
Commercial Paper | 457,000,000 | 457,000,000 | 0 |
Indebtedness to cash flow |  | 4 |  |
3 Year Facility [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Size of total commercial paper program | 1,200,000,000 | 1,200,000,000 |  |
Commercial Paper [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commercial paper interest rate | 0.48% | 0.48% |  |
Commercial Paper, Average Term |  | 28 days |  |
Funds available through debt instrument | $ 743,000,000 | $ 743,000,000 |  |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a(3) -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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