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Debt (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Long-term Debt      
Other indebtedness $ 35,000,000   $ 28,000,000
Long-term debt 4,124,000,000   4,117,000,000
Short-term Debt      
Other indebtedness 4,000,000   6,000,000
Total short-term debt 4,000,000   6,000,000
Total debt 4,128,000,000   4,123,000,000
Other Indebtedness      
Total present value of future minimum capital lease payments 2,000,000    
Capital lease obligation, interest included in payments, less than $1million 1,000,000    
Commercial Paper [Member]
     
Commercial Paper      
Commercial paper program amount 2,000,000,000    
Maximum days to maturity of debt instruments 397 days    
Line of Credit [Member]
     
Credit Agreement [Abstract]      
Maximum borrowing capacity 3,000,000,000    
Capacity reserved 2,000,000,000    
Remaining borrowing capacity 1,000,000,000    
Amount outstanding 0    
Letters of credit outstanding 0    
Unsecured Debt
     
Long-term Debt      
Long-term debt 4,089,000,000   4,089,000,000
Senior Notes      
Interest expense 25,000,000 26,000,000  
Estimated fair value of notes included in long-term debt 4,000,000,000    
Unsecured Debt | Notes 2015 - October [Member]
     
Long-term Debt      
Coupon Rate 1.625%    
Long-term debt 599,000,000   599,000,000
Effective Interest Rate 1.805%   1.805%
Unsecured Debt | Notes 2015 - July [Member]
     
Long-term Debt      
Coupon Rate 0.70%    
Long-term debt 250,000,000   250,000,000
Effective Interest Rate 0.82%   0.82%
Unsecured Debt | Notes 2017 [Member]
     
Long-term Debt      
Coupon Rate 1.35%    
Long-term debt 1,000,000,000   1,000,000,000
Effective Interest Rate 1.456%   1.456%
Unsecured Debt | Notes 2020 - October [Member]
     
Long-term Debt      
Coupon Rate 3.25%    
Long-term debt 498,000,000   498,000,000
Effective Interest Rate 3.389%   3.389%
Unsecured Debt | Notes 2022 [Member]
     
Long-term Debt      
Coupon Rate 2.60%    
Long-term debt 999,000,000   999,000,000
Effective Interest Rate 2.678%   2.678%
Unsecured Debt | Notes 2042 [Member]
     
Long-term Debt      
Coupon Rate 4.00%    
Long-term debt $ 743,000,000   $ 743,000,000
Effective Interest Rate 4.114%   4.114%
Overdraft Facilities [Member]
     
Other Indebtedness      
Interest rate, maximum 10.00%    
Capital Lease Obligations [Member]
     
Other Indebtedness      
Interest rate, minimum 3.00%    
Interest rate, maximum 7.00%    
Mortgages [Member]
     
Long-term Debt      
Coupon Rate 6.30%