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Long-Term Debt and Credit Facilities (Maturities Of Long-Term Debt Disclosures) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Senior Unsecured Notes 3.00% Due 2015 [Member]
Dec. 31, 2012
Senior Unsecured Notes 3.00% Due 2015 [Member]
Dec. 31, 2013
Senior Unsecured Notes 4.375% Due 2020 [Member]
Dec. 31, 2012
Senior Unsecured Notes 4.375% Due 2020 [Member]
Dec. 31, 2013
Senior Unsecured Notes 2.00% due 2016 [Member]
Dec. 31, 2012
Senior Unsecured Notes 2.00% due 2016 [Member]
Dec. 31, 2011
Senior Unsecured Notes 2.00% due 2016 [Member]
Dec. 31, 2013
Senior Unsecured Notes 1.30% due 2018 [Member]
Mar. 31, 2013
Senior Unsecured Notes 1.30% due 2018 [Member]
Dec. 31, 2013
Senior Unsecured Notes 4.10% due 2043 [Member]
Mar. 31, 2013
Senior Unsecured Notes 4.10% due 2043 [Member]
Debt Instrument, Interest Rate, Stated Percentage     3.00%   4.375%   2.00%   2.00% 1.30% 1.30% 4.10% 4.10%
3.00% senior unsecured notes, due January 15, 2015     $ 500 $ 500                  
4.375% senior unsecured notes, due January 15, 2020         498 497       598   394  
2.00% senior unsecured notes, due September 30, 2016             749 749          
Other 25 16                      
Total debt 2,764 1,762                      
Less current maturities (25) (16)                      
Total Long-term Debt $ 2,739 $ 1,746