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Borrowings and Lines of Credit (Additional Information) (Details)
€ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
Dec. 31, 2015
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2018
Dec. 31, 2017
USD ($)
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        
Term of credit agreement   5 years                      
Revolving credit facility outstanding               $ 1,800,000,000          
Line of credit facility, additional borrowing capacity available to lender conditions               $ 500,000,000          
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       $ 7,000,000 $ 8,000,000 $ 9,000,000   $ 588,000,000   $ 379,000,000 $ 340,000,000    
Debt instrument, face amount                       $ 1,260,000,000 € 1,200
Proceeds from notes payable     $ 987,000,000             1,240,000,000      
Rental expenses for operating leases               288,000,000   273,000,000 $ 260,000,000    
Line of credit, amount outstanding     0         0   0      
Outstanding letters of credit and surety bonds     160,000,000         163,000,000   160,000,000      
Guarantees outstanding     12,000,000         14,000,000   12,000,000      
Commercial paper                          
Debt Instrument [Line Items]                          
Line of credit, amount outstanding     0         $ 0   0      
Notes 1.9 Percent Due 2016                          
Debt Instrument [Line Items]                          
Notional amount of non-derivative instruments $ 250,000,000                        
Debt instrument, interest rate, stated percentage 1.90%             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               $ 336,000,000          
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%          
3-year Variable Rate Euro Bank Loan Due 2017                          
Debt Instrument [Line Items]                          
Notional amount of non-derivative instruments | €                 € 500        
Repayments of debt               $ 587,000,000          
Notes 2.5 Percent Due 2029                          
Debt Instrument [Line Items]                          
Notional amount of non-derivative instruments | €                 80        
Debt instrument, interest rate, stated percentage               2.50%          
Notes 3.0 Percent Due 2044                          
Debt Instrument [Line Items]                          
Notional amount of non-derivative instruments | €                 € 120        
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               $ 10,000,000          
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               $ 50,000,000          
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     1,000,000         $ 1,000,000   1,000,000      
Fair value of guarantees     $ 1,000,000         1,000,000   $ 1,000,000      
International Operations                          
Debt Instrument [Line Items]                          
Lines of credit, current borrowing capacity               589,000,000          
Line of credit, amount outstanding               $ 2,000,000          
Scenario, Forecast                          
Debt Instrument [Line Items]                          
Unused capacity, commitment fee percentage             0.09%