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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.