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Borrowings and Lines of Credit (Additional Information) (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
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   1.77%              
Unused capacity, commitment fee percentage   0.09% 0.09%            
Total indebtedness to total capitalization ratio requirement   60.00%              
Ratio of indebtedness to net capital   0.451              
Repayments of debt   $ 379   340 $ 1,803        
Debt instrument, face amount           $ 1,260 € 1,200    
Proceeds from Notes Payable   987   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   0 (317)        
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     1,707        
Rental expenses for operating leases   275   265 $ 282        
Outstanding letters of credit and surety bonds   160   165          
Guarantees outstanding   $ 12   24          
Credit Agreement                  
Debt Instrument [Line Items]                  
Debt instrument, term   5 years 5 years            
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% 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   0.31%              
Notes 2.5 Percent Due 2029                  
Debt Instrument [Line Items]                  
Debt instrument, interest rate, stated percentage   2.50%           2.50% 2.50%
Debt instrument, face amount | €                 € 80
Proceeds from Notes Payable | €     € 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 Notes Payable   $ 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              
Long-term Debt, Contingent Payment of Principal or Interest   10 10            
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              
Minimum                  
Debt Instrument [Line Items]                  
Unused capacity, commitment fee percentage   0.08% 0.08%            
Periodic payment amount   $ 50              
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          
Fair value of guarantees   1   $ 1          
International Operations                  
Debt Instrument [Line Items]                  
Lines of credit, current borrowing capacity   942              
Line of credit, amount outstanding   $ 88              
Scenario, Forecast                  
Debt Instrument [Line Items]                  
Unused capacity, commitment fee percentage 0.09%