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Borrowings and Lines of Credit (Additional Information) (Details)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2015
EUR (€)
Dec. 31, 2014
USD ($)
Mar. 31, 2013
USD ($)
Dec. 31, 2016
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2015
EUR (€)
Nov. 30, 2014
USD ($)
Nov. 30, 2014
EUR (€)
Debt Instrument [Line Items]                        
Notional amount of non-derivative instruments | € € 300         € 300            
Revolving credit facility outstanding         $ 1,800              
Line of credit facility, additional borrowing capacity available to lender conditions         $ 500              
Hypothetical rate on the credit agreement         1.43%              
Unused capacity, commitment fee percentage         0.10% 0.10%            
Total indebtedness to total capitalization ratio requirement         60.00%              
Ratio of indebtedness to net capital         0.405              
Repayments of debt         $ 340   $ 1,489 $ 605        
Debt instrument, face amount                 $ 1,260 € 1,200    
Proceeds from fixed rate note         1,240              
Aggregate amount of principal of debt redeemed         1,500              
Aggregate amount of principal of debt redeemed via tender offer         90              
Premiums to be paid to the debt holders         43   43          
Debt refinancing charge         0   (317) 0        
Total of make-whole premiums paid to redeem notes         179   179          
Unamortized interest rate swaps and forward starting swap losses   $ 89                    
Realization of unamortized fees and discounts   6                    
Debt proceeds used in early retirement of existing long-term debt   $ 1,200                    
Total cash paid for debt redemption         1,707              
Typical grace period for debt payments under debt provisions   10 years                    
Rental expenses for operating leases         266   284 $ 256        
Outstanding letters of credit and surety bonds   $ 120     165   120          
Guarantees outstanding   25     $ 24   25          
Credit Agreement                        
Debt Instrument [Line Items]                        
Debt instrument, term         5 years 5 years            
Notes 5.75 Percent Due 2013                        
Debt Instrument [Line Items]                        
Repayments of debt     $ 600                  
Notes 1.9 Percent Due 2016                        
Debt Instrument [Line Items]                        
Notional amount of non-derivative instruments | €           € 250            
Debt instrument, interest rate, stated percentage         1.90%              
Notes 3.875 Percent Due 2015                        
Debt Instrument [Line Items]                        
Debt instrument, interest rate, stated percentage         3.875%              
Net Investment Hedging                        
Debt Instrument [Line Items]                        
Repayments of debt         $ 336              
7-year Fixed Rate Euro Bank Loan Due 2022                        
Debt Instrument [Line Items]                        
Debt instrument, interest rate, stated percentage                 0.875% 0.875%    
Debt instrument, face amount | €                   € 600    
12-year Fixed Rate Euro Bank Loan Due 2027                        
Debt Instrument [Line Items]                        
Debt instrument, interest rate, stated percentage                 1.40% 1.40%    
Debt instrument, face amount | €                   € 600    
Notes 2.3 Percent Due 2019                        
Debt Instrument [Line Items]                        
Debt instrument, interest rate, stated percentage                     2.30% 2.30%
Debt instrument, face amount                     $ 300  
Percentage of debt redemption price                 101.00% 101.00% 101.00% 101.00%
3-year Variable Rate Euro Bank Loan Due 2017                        
Debt Instrument [Line Items]                        
Debt instrument, face amount | €                       € 500
Average interest rate         0.47%              
Notes 2.5 Percent Due 2029                        
Debt Instrument [Line Items]                        
Debt instrument, interest rate, stated percentage                     2.50% 2.50%
Debt instrument, face amount | €                       € 80
Proceeds from fixed rate note | €           € 99            
Debt instrument, term         15 years 15 years            
Notes 3.0 Percent Due 2044                        
Debt Instrument [Line Items]                        
Debt instrument, interest rate, stated percentage                     3.00% 3.00%
Debt instrument, face amount | €                       € 120
Proceeds from fixed rate note         $ 142              
Debt instrument, term         30 years 30 years            
Non-callable Debentures 9 Percent Due 2021                        
Debt Instrument [Line Items]                        
Debt instrument, interest rate, stated percentage         9.00%              
Principal amount of debt redeemed via tender offer for each $1,000 of principal offered         $ 1,334              
Notes 7.70 Percent Due 2038                        
Debt Instrument [Line Items]                        
Debt instrument, interest rate, stated percentage         7.70%              
Principal amount of debt redeemed via tender offer for each $1,000 of principal offered         $ 1,506              
Notes 5.75 Percent Due 2013                        
Debt Instrument [Line Items]                        
Debt instrument, interest rate, stated percentage     5.75%                  
Minimum                        
Debt Instrument [Line Items]                        
Unused capacity, commitment fee percentage         0.08% 0.08%            
Periodic payment amount         $ 10              
Maximum                        
Debt Instrument [Line Items]                        
Unused capacity, commitment fee percentage         0.225% 0.225%            
Guarantee of Indebtedness of Others                        
Debt Instrument [Line Items]                        
Carrying value of guarantees   1     $ 1   1          
Fair value of guarantees   $ 2     1   $ 2          
International Operations                        
Debt Instrument [Line Items]                        
Lines of credit, current borrowing capacity         621              
Line of credit, amount outstanding         $ 29              
Scenario, Forecast                        
Debt Instrument [Line Items]                        
Unused capacity, commitment fee percentage       0.09%