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Borrowings and Lines of Credit (Additional Information) (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2015
EUR (€)
Debt Instrument [Line Items]              
Notional amount of non-derivative instruments | €     € 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   2.56%          
Unused capacity, commitment fee percentage   0.09% 0.09%        
Total indebtedness to total capitalization ratio requirement   60.00%          
Ratio of indebtedness to net capital   0.41          
Repayments of debt   $ 588   $ 379 $ 340    
Debt instrument, face amount           $ 1,260 € 1,200
Proceeds from Notes Payable   987   1,240      
Rental expenses for operating leases   288   273 $ 260    
Outstanding letters of credit and surety bonds   163   160      
Guarantees outstanding   $ 14   12      
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%          
Percentage of debt redemption price           101.00% 101.00%
3-year Variable Rate Euro Bank Loan Due 2017              
Debt Instrument [Line Items]              
Notional amount of non-derivative instruments   $ 500          
Repayments of debt   $ 587          
Notes 2.5 Percent Due 2029              
Debt Instrument [Line Items]              
Debt instrument, interest rate, stated percentage   2.50%          
Notes 3.0 Percent Due 2044              
Debt Instrument [Line Items]              
Debt instrument, interest rate, stated percentage   3.00%          
Non-callable Debentures 9 Percent Due 2021              
Debt Instrument [Line Items]              
Debt instrument, interest rate, stated percentage   9.00%          
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%          
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   589          
Line of credit, amount outstanding   $ 2          
Scenario, Forecast              
Debt Instrument [Line Items]              
Unused capacity, commitment fee percentage 0.09%