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Financing Arrangements (Narrative) (Details)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2013
Credit Facility maturing June 28 2016
USD ($)
Dec. 31, 2012
Credit Facility maturing June 28 2016
USD ($)
Dec. 31, 2013
Committed Credit Facility Brazil maturing 2014
USD ($)
Dec. 31, 2013
Committed Credit Facility Brazil maturing 2014
BRL
Dec. 31, 2012
Committed Credit Facility Brazil maturing 2014
USD ($)
Mar. 31, 2013
Debt Matured March 2013
USD ($)
May 01, 2012
Debt Matured
USD ($)
Jun. 01, 2012
Debt Issued
USD ($)
Feb. 27, 2013
Debt Issued Due 2023
USD ($)
Feb. 27, 2013
Debt Issued Due 2043
USD ($)
Dec. 31, 2013
Senior note—4.70%, maturing 2022
USD ($)
Dec. 31, 2012
Senior note—4.70%, maturing 2022
USD ($)
Dec. 31, 2013
Senior note—5.15% maturing 2043
USD ($)
Dec. 31, 2012
Senior note—5.15% maturing 2043
USD ($)
Dec. 31, 2013
Senior note—3.70% maturing 2023
USD ($)
Dec. 31, 2012
Senior note—3.70% maturing 2023
USD ($)
Debt Instrument [Line Items]                                    
Long-term Debt $ 2,453,000,000 $ 2,454,000,000                     $ 300,000,000 $ 300,000,000 $ 250,000,000 $ 0 $ 250,000,000 $ 0
Long-term Debt, Fair Value 2,600,000,000                                  
Debt Instrument, Face Amount               500,000,000 350,000,000 300,000,000 250,000,000 250,000,000            
Debt Instrument, Interest Rate, Stated Percentage               5.50%     3.70% 5.15% 4.70% 4.70% 5.15%   3.70%  
Repurchase of Notes, Purchase Price Percentage of Principle Amount                     101.00% 101.00%            
Debt Instrument, Interest Rate, Effective Percentage                 8.00% 4.70%                
Repurchase Of Notes, Purchase Price Percentage Of Principal Amount                   101.00%                
Line of Credit Facility, Maximum Borrowing Capacity     1,725,000,000   478,000,000 1,120,000,000                        
Line of Credit Facility, Current Borrowing Capacity     200,000,000                              
Line of Credit Facility, Amount Outstanding     0.00 0.00 0   0                      
Commercial Paper $ 0 $ 0