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Long-Term Debt (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Mar. 15, 2011
Oct. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Nov. 15, 2010
Dec. 31, 2009
Dec. 31, 2011
ABR-Based Loans [Member]
Oct. 31, 2010
Commercial Paper Rate Plus [Member]
Dec. 31, 2011
Credit Agreement And Securitization [Member]
Dec. 31, 2010
Credit Agreement And Securitization [Member]
Dec. 31, 2009
Credit Agreement And Securitization [Member]
Oct. 29, 2010
7.00% Senior Unsecured Notes [Member]
Sep. 29, 2010
7.00% Senior Unsecured Notes [Member]
Dec. 31, 2011
7.00% Senior Unsecured Notes [Member]
Jun. 30, 2006
7.125% Coupon Rate Senior Notes Due 2016 [Member]
Dec. 31, 2011
7.125% Coupon Rate Senior Notes Due 2016 [Member]
Jun. 30, 2008
7.125% Coupon Rate Senior Notes Due 2016 [Member]
Dec. 31, 2011
6.75% Coupon Rate Senior Notes [Member]
Dec. 31, 2001
6.75% Coupon Rate Senior Notes [Member]
Dec. 31, 2011
Matures October 1, 2014 [Member]
Dec. 31, 2011
Matures October 1, 2015 [Member]
Dec. 31, 2011
Matures October 1, 2016 [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Nov. 15, 2010
Revolving Credit Facility [Member]
Dec. 31, 2011
Letters Of Credit [Member]
Nov. 15, 2010
Letters Of Credit [Member]
Mar. 31, 2011
Term Loan B Facility [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Dec. 31, 2010
Term Loan B Facility [Member]
Nov. 15, 2010
Term Loan B Facility [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Eurodollar-Based Loans [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Minimum [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Maximum [Member]
Dec. 31, 2011
Term Loan A Facility [Member]
Dec. 31, 2010
Term Loan A Facility [Member]
Nov. 15, 2010
Term Loan A Facility [Member]
Dec. 31, 2011
Short-Term, On-Demand Credit Facility [Member]
Dec. 31, 2011
Term Loan A Facility [Member]
Eurodollar-Based Loans [Member]
Dec. 31, 2011
Term Loan A Facility [Member]
Minimum [Member]
One Month Eurodollar Rate Plus Index Based Loans [Member]
Dec. 31, 2011
Term Loan A Facility [Member]
Minimum [Member]
One, Two, Three, Six Month Eurodollar Rate Plus Index Based Loans [Member]
Dec. 31, 2011
Term Loan A Facility [Member]
Maximum [Member]
One Month Eurodollar Rate Plus Index Based Loans [Member]
Dec. 31, 2011
Term Loan A Facility [Member]
Maximum [Member]
One, Two, Three, Six Month Eurodollar Rate Plus Index Based Loans [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Minimum [Member]
One Month Eurodollar Rate Plus Index Based Loans [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Minimum [Member]
One, Two, Three, Six Month Eurodollar Rate Plus Index Based Loans [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Maximum [Member]
One Month Eurodollar Rate Plus Index Based Loans [Member]
Dec. 31, 2011
Term Loan B Facility [Member]
Maximum [Member]
One, Two, Three, Six Month Eurodollar Rate Plus Index Based Loans [Member]
Debt Instrument [Line Items]                                                                                              
Line of credit facility amount outstanding         $ 3,450,000,000                                     $ 800,000,000   $ 125,000,000   $ 1,436,772,000 $ 1,576,500,000 $ 1,600,000,000       $ 1,020,375,000 $ 1,042,322,000 $ 1,050,000,000                      
Variable interest rate               0.475%                                                                              
Principal payments                                                     125,000,000 16,000,000           26,000,000                          
Line of credit facility, maturity date                                                       November 15, 2016           November 15, 2015                          
Credit agreement, interest rate description Upon the effectiveness of the Amendment, borrowings under the Credit Agreement bear interest at the ABR rate which is defined as the rate per annum equal to, at our election (1) the greatest of (a) the lender's prime rate, (b) the weighted average of the federal funds rate, plus 0.5% and (c) one month Eurodollar rate plus 1%, in each case, plus an applicable margin based upon our consolidated leverage ratio at the end of each quarter ranging from 0.50% to 1.25% for revolving credit and Term Loan A borrowings and 1.75% to 2.00% for Term Loan B borrowings or (2) the one, two, three or six month Eurodollar rate (at our election), plus an applicable margin based upon our consolidated leverage ratio at the end of each quarter ranging from 1.50% to 2.25% for revolving credit and Term Loan A borrowings and ranging from 2.75% to 3.00% for Term Loan B borrowings. The current applicable margins are 0.75% for ABR-based loans, 1.75% for Eurodollar-based loans under the revolving credit and Term Loan A facilities and 2.75% under the Term Loan B facility The interest rate on the borrowings is based on the commercial paper rate plus a spread of 0.475% and there is a facility fee of 0.375% required on 102% on the Commitments                                                                                          
Credit facility fee, percentage   0.375%                                                                                          
Rate adjustment to weighted average federal funds rate for credit facility borrowings                                             0.50%                                                
Rate adjustment to one month Eurodollar rate on credit facility borrowings                                             1.00%                                                
Current applicable margins             0.75%                                               2.75%             1.75%                  
Consolidated leverage ratio                                                                             0.50% 1.50% 1.25% 2.25%   1.75% 2.75% 2.00% 3.00%
Fee paid in accordance with the terms of the credit agreement                                                                                     1.00%        
Accounts receivable securitization program credit facility, borrowing capacity   240,000,000                                                                                          
Accounts receivable securitization program credit facility original amount   200,000,000                                                                                          
Accounts receivable securitization program credit facility, maturity date   Oct. 25, 2013                                                                                          
Accounts receivable securitization program credit facility, amount outstanding     240,000,000                                                                                        
Available borrowing capacity                 482,000,000                                                                            
Amount outstanding                                                 69,000,000                       9,000,000                    
Outstanding borrowings under a short-term, on-demand credit facility     9,000,000                                                                                        
Senior notes, issued                         250,000,000   250,000,000   150,000,000   200,000,000                                                        
Interest rate                         7.00%   7.125%   7.125%   6.75%                                                        
Senior notes, maturity date                           October 1, 2018   June 30, 2016   November 15, 2011   October 1, 2014 October 1, 2015 October 1, 2016                                                  
Treasury rate plus, basis points                         50                                                                    
Unsecured notes make-whole redemption price, percent                                       103.50% 101.75% 100.00%                                                  
Average amounts outstanding under Credit Agreement, Prior Credit Agreement, demand notes and accounts receivable securitization programs                 2,900,000,000 610,000,000 287,000,000                                                                        
Maximum amounts outstanding at any month-end                 3,030,000,000 3,110,000,000 356,000,000                                                                        
Effective interest rate     4.60% 5.00%   3.90%     3.40% 3.40% 1.70%                                                                        
Commitment percentage for facility fee   102.00%                                                                                          
Minimum Eurodollar rate for the term loan B facility                                                               1.00% 1.50%                            
Senior notes, repayment terms                       payable semiannually in arrears on April 1st and October 1st of each year.     Interest on the 7.125% Notes is payable semiannually in arrears on June 30th and December 30th of each year                                                                
Fair value of debt     $ 3,700,000,000 $ 3,960,000,000                                                                                      
Ownership percentage in directly owned subsidiary     100.00%