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Debt (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2012 Financial_Covenants | Jul. 16, 2012 5.875% Notes and Debentures due July 15, 2012 [Member] | Jun. 30, 2012 5.875% Notes and Debentures due July 15, 2012 [Member] | Jun. 30, 2012 5.95% Notes and Debentures due March 15, 2022 [Member] | Mar. 05, 2012 5.95% Notes and Debentures due March 15, 2022 [Member]
Debt Instrument [Line Items] |  |  |  |  |
Interest on notes |  |  | 5.875% | 5.95% |
Issued notes | $ 400 | $ 745 |  |  | $ 400
Additional borrowing capacity after the retirement |  | 900 |  |  |
Absorption of reduction to shareholders' equity to remain in compliance with covenant | 302 | 487 |  |  |
Debt (Textual) [Abstract] |  |  |  |  |
Effective interest rate for notes | 6.50% |  |  |  |
Financial covenants | 2 |  |  |  |
Company repurchased Notes in open-market transactions | 46 |  |  |  |
Premium paid on repurchase of notes | 1 |  |  |  |
Additional borrowing capacity | 561 |  |  |  |
Borrowings under Five Year Revolving Credit Agreement | $ 0 |  |  |  |

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- Definition Financial covenants. + References No definition available. + Details
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- Definition Decrease for amounts repaid on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph f Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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