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Debt Summary of outstanding debt (Details)
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 1997
Dec. 31, 2013
6.25% EUR 500 debt securities due July 2014 [Member]
USD ($)
Dec. 31, 2013
6.25% EUR 500 debt securities due July 2014 [Member]
EUR (€)
Dec. 31, 2012
6.25% EUR 500 debt securities due July 2014 [Member]
USD ($)
Jul. 02, 2009
6.25% EUR 500 debt securities due July 2014 [Member]
USD ($)
Dec. 31, 2013
5.00% Senior notes due September 2020 [Member]
USD ($)
Dec. 31, 2012
5.00% Senior notes due September 2020 [Member]
USD ($)
Sep. 07, 2010
5.00% Senior notes due September 2020 [Member]
USD ($)
Dec. 31, 2013
3.50% senior notes due September 2015 [Member]
USD ($)
Dec. 31, 2012
3.50% senior notes due September 2015 [Member]
USD ($)
Sep. 07, 2010
3.50% senior notes due September 2015 [Member]
USD ($)
Dec. 31, 2013
8.205% Junior subordinated deferrable interest debentures due January 2027 [Member]
USD ($)
Dec. 31, 2012
8.205% Junior subordinated deferrable interest debentures due January 2027 [Member]
USD ($)
Dec. 31, 2013
3.125% Senior notes due May 2016 [Member]
USD ($)
Dec. 31, 2012
3.125% Senior notes due May 2016 [Member]
USD ($)
May 24, 2011
3.125% Senior notes due May 2016 [Member]
USD ($)
Dec. 31, 2013
4.768% CAD 375 debt securities due March 2018 [Member]
USD ($)
Dec. 31, 2013
4.768% CAD 375 debt securities due March 2018 [Member]
CAD
Dec. 31, 2012
4.768% CAD 375 debt securities due March 2018 [Member]
USD ($)
Mar. 08, 2011
4.768% CAD 375 debt securities due March 2018 [Member]
CAD
Dec. 31, 2013
4.00% senior notes dues November 2023 [Member]
USD ($)
Nov. 21, 2013
4.00% senior notes dues November 2023 [Member]
USD ($)
Dec. 31, 2012
4.00% senior notes dues November 2023 [Member]
USD ($)
Dec. 31, 2013
6.25% Senior notes due September 2040 [Member]
USD ($)
Dec. 31, 2012
6.25% Senior notes due September 2040 [Member]
USD ($)
Sep. 07, 2010
6.25% Senior notes due September 2040 [Member]
USD ($)
Dec. 31, 2013
4.45% senior notes due May 2043 [Member]
USD ($)
May 21, 2013
4.45% senior notes due May 2043 [Member]
USD ($)
Dec. 31, 2012
4.45% senior notes due May 2043 [Member]
USD ($)
Dec. 31, 2013
4.25% senior notes due December 2042 [Member]
USD ($)
Apr. 15, 2013
4.25% senior notes due December 2042 [Member]
USD ($)
Mar. 08, 2013
4.25% senior notes due December 2042 [Member]
USD ($)
Dec. 31, 2012
4.25% senior notes due December 2042 [Member]
USD ($)
Dec. 12, 2012
4.25% senior notes due December 2042 [Member]
USD ($)
Dec. 31, 2013
Term loan credit facility due October 2013 [Member]
USD ($)
Dec. 31, 2012
Term loan credit facility due October 2013 [Member]
USD ($)
Jun. 15, 2011
Term loan credit facility due October 2013 [Member]
USD ($)
Dec. 31, 2013
Term loan credit facility due October 2013 [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2013
Other [Member]
USD ($)
Dec. 31, 2012
Other [Member]
USD ($)
Debt Instrument [Line Items]                                                                                    
Total debt $ 4,389,000,000 $ 4,165,000,000   $ 685,000,000   $ 661,000,000   $ 599,000,000 $ 598,000,000   $ 599,000,000 $ 598,000,000   $ 521,000,000 $ 521,000,000 $ 500,000,000 $ 500,000,000   $ 352,000,000   $ 377,000,000   $ 349,000,000   $ 0 $ 298,000,000 $ 297,000,000   $ 248,000,000   $ 0 $ 195,000,000     $ 107,000,000   $ 0 $ 383,000,000     $ 43,000,000 $ 123,000,000
Less short-term and current portion of long-term debt 703,000,000 452,000,000                                                                                
Total long-term debt 3,686,000,000 3,713,000,000                                                                                
Debt face value         € 500,000,000 $ 661,000,000 $ 500,000,000     $ 600,000,000     $ 600,000,000         $ 500,000,000   375,000,000   375,000,000   $ 350,000,000       $ 300,000,000   $ 250,000,000     $ 256,000,000 $ 90,000,000   $ 166,000,000     $ 450,000,000      
Interest rate on debt     8.205% 6.25% 6.25%   6.25% 5.00%   5.00% 3.50%   3.50% 8.205% 8.205% 3.125%   3.125% 4.76% 4.76%   4.76% 4.00% 4.00%   6.25%   6.25% 4.45% 4.45%   4.25% 4.25% 4.25%   4.25%            
Basis spread on variable rate                                                                               1.38%