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Debt (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 5.375% Senior Notes, due 2012 [Member] | Nov. 15, 2012 5.375% Senior Notes, due 2012 [Member] | Dec. 31, 2011 5.375% Senior Notes, due 2012 [Member] | Dec. 31, 2012 5.9% Senior Notes, due 2017 [Member] | Dec. 31, 2011 5.9% Senior Notes, due 2017 [Member] | Dec. 31, 2012 6.55% Senior Notes, due 2037 [Member] | Dec. 31, 2011 6.55% Senior Notes, due 2037 [Member] | Dec. 31, 2012 Three Years Facility [Member] | Dec. 31, 2012 Commercial Paper [Member] | Dec. 31, 2011 Commercial Paper [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes |  |  | $ 0 |  | $ 400 | $ 400 | [1] | $ 399 | [1] | $ 399 | [2] | $ 399 | [2] |  |  |
Short-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 457 | 0
Debt, Long-term and Short-term, Combined Amount | 1,256 | 1,198 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: short-term debt including current maturities | 457 | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 799 | 798 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 5.375% |  | 5.375% | 5.90% |  | 5.90% |  | 6.55% |  | 6.55% |  |  |  |
Unamortized debt discount on senior notes |  |  |  |  |  | 0.5 |  |  |  | 1.3 |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 400 |  |  |  |  |  |  |  |  |  |  |  |
Annual long term debt maturity year one | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual long term debt maturity year two | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual long term debt maturity year three | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual long term debt maturity year four | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual long term debt maturity year five | 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual long term debt maturity after year five | $ 399 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee description | 15 to 35 basis points, depending on credit rating and currently pay a commitment fee of 20 basis points |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee minimum percentage | 0.15% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee maximum percentage | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current commitment fee |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.20% |  |
[1] | Interest payments are due semiannually on April 15 and October 15, and as of December 31, 2012, the unamortized debt discount is $0.5 million.
[2] | Interest payments are due semiannually on May 15 and November 15, and as of December 31, 2012, the unamortized debt discount is $1.3 million.

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