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Debt - Narrative (Details)
€ in Millions
12 Months Ended
Oct. 14, 2021
USD ($)
Oct. 03, 2019
USD ($)
Oct. 03, 2018
USD ($)
Oct. 14, 2016
USD ($)
Nov. 02, 2015
USD ($)
Jun. 15, 2015
USD ($)
Apr. 01, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2016
EUR (€)
Sep. 30, 2016
USD ($)
Debt Instrument [Line Items]                        
Repayments of Debt               $ 653,000,000 $ 1,027,000,000 $ 582,000,000    
Short-term Debt               14,000,000 $ 426,000,000      
Senior notes due 2024 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, stated interest rate (in percentage)                 0.00%   0.75% 0.75%
Debenture [Member] | Debentures due 2016 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, stated interest rate (in percentage)                 2.375%      
Long term debt debentures               $ 0 $ 240,000,000      
Debenture [Member] | Debenture due 2015 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, stated interest rate (in percentage)               5.45%        
Repayments of Debt             $ 300,000,000          
Notes [Member] | Debentures due 2016 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, stated interest rate (in percentage)               2.38%        
Notes [Member] | Notes due 2015 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, stated interest rate (in percentage)               4.65%        
Repayments of Debt           $ 100,000,000            
Notes [Member] | Senior notes due 2024 [Member]                        
Debt Instrument [Line Items]                        
Long term debt debentures               $ 580,000,000 0      
Senior Notes [Member]                        
Debt Instrument [Line Items]                        
Issuance of senior notes                     € 550 $ 615,000,000
Proceeds from issuance of senior notes                     € 544 $ 609,000,000
Senior Notes [Member] | Senior notes due 2015 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, stated interest rate (in percentage)               0.95%        
Repayments of Debt         $ 600,000,000              
Senior Notes [Member] | Senior notes due 2024 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, stated interest rate (in percentage)                     0.75% 0.75%
Refinanced five-year revolving credit facility [Member]                        
Debt Instrument [Line Items]                        
Credit facility, maximum borrowing capacity       $ 750,000,000                
Revolving credit facility, term (in years)       5 years                
Four-year revolving credit facility, expires October 3, 2018 [Member]                        
Debt Instrument [Line Items]                        
Credit facility, maximum borrowing capacity     $ 500,000,000                  
Revolving credit facility, term (in years)     4 years                  
Five-year revolving credit facility, expires October 3, 2019 [Member]                        
Debt Instrument [Line Items]                        
Credit facility, maximum borrowing capacity   $ 750,000,000                    
Revolving credit facility, term (in years) 5 years 5 years                    
Revolving Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Credit facility, maximum borrowing capacity               $ 2,000,000,000        
Long-term line of credit               0 $ 0      
Letter of Credit [Member]                        
Debt Instrument [Line Items]                        
Credit facility, maximum borrowing capacity               823,000,000        
Letters of credit outstanding, amount               $ 285,000,000        
Scenario, Actual [Member] | Subsequent Event [Member] | Five-year revolving credit facility, expires October 14, 2021 [Member]                        
Debt Instrument [Line Items]                        
Credit facility, maximum borrowing capacity $ 750,000,000