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Credit Facilities and Debt (Textuals) (Details)
3 Months Ended
Apr. 30, 2020
USD ($)
Mar. 19, 2020
EUR (€)
Sep. 20, 2011
USD ($)
Mar. 31, 2020
USD ($)
Apr. 25, 2020
EUR (€)
Apr. 25, 2020
USD ($)
Dec. 31, 2019
USD ($)
Nov. 29, 2019
EUR (€)
Nov. 29, 2019
USD ($)
Jun. 03, 2019
EUR (€)
Jun. 03, 2019
USD ($)
Mar. 05, 2019
USD ($)
Oct. 20, 2016
EUR (€)
Oct. 20, 2016
USD ($)
Oct. 11, 2016
USD ($)
Mar. 11, 2016
EUR (€)
Mar. 11, 2016
USD ($)
Senior Notes                                  
Debt Instrument                                  
Redemption price percentage     101.00%                            
Senior Notes Due 2021, 4.875%                                  
Debt Instrument                                  
Fair value of senior notes due       $ 640,000,000     $ 629,000,000                    
Interest rate     4.875%                            
Senior Notes Due [1]       600,000,000     600,000,000                    
Face amount     $ 600,000,000                            
Senior Notes Due 2023, 2.250%                                  
Debt Instrument                                  
Fair value of senior notes due       565,000,000     591,000,000                    
Senior Notes Due [1]       547,000,000     557,000,000                    
Senior Notes Due 2023, 2.250% | Senior Notes                                  
Debt Instrument                                  
Interest rate                               2.25% 2.25%
Face amount                               € 500,000,000 $ 500,000,000
Senior Notes due 2026                                  
Debt Instrument                                  
Fair value of senior notes due       533,000,000     518,000,000                    
Interest rate                             3.25%    
Senior Notes Due [1]       500,000,000     500,000,000                    
Face amount                             $ 500,000,000    
Senior Notes due 2046                                  
Debt Instrument                                  
Fair value of senior notes due       400,000,000     431,000,000                    
Interest rate                             4.375%    
Senior Notes Due [1]       $ 400,000,000     400,000,000                    
Face amount                             $ 400,000,000    
2015 Five-Year Revolving Credit Facility | Revolving Credit Facility                                  
Debt Instrument                                  
Term of debt       5 years                          
2019 Five-Year Revolving Credit Facility | Revolving Credit Facility                                  
Debt Instrument                                  
Term of debt       5 years                          
Debt instrument aggregate principal amount                       $ 800,000,000          
Permitted increases in Credit Facility borrowing base                       200,000,000          
Maximum permitted increases in Credit Facility borrowing base                       $ 1,000,000,000          
US Dollar Commercial Paper Program                                  
Debt Instrument                                  
Face amount       $ 600,000,000                          
Commercial paper                                  
Debt Instrument                                  
Senior Notes Due       268,000,000     276,000,000                    
Euro Commercial Paper Program                                  
Debt Instrument                                  
Face amount                   € 500,000,000 $ 547,000,000            
Commercial Paper       $ 268,000,000             $ 276,000,000            
Weighted-average interest rate       (0.21%)                          
Uncommitted Short Term Facility                                  
Debt Instrument                                  
Face amount                         € 110,000,000 $ 120,000,000      
Proceeds from Issuance of Unsecured Debt | €   € 100,000,000                              
Debt Instrument, Interest Rate, Effective Percentage   0.70%                              
Short-term Debt       $ 120,000,000     $ 0                    
Uncommitted Short Term Facility, BGL BNP Paribas Bank                                  
Debt Instrument                                  
Face amount               € 65,000,000 $ 71,000,000                
Proceeds from Issuance of Unsecured Debt | €   € 65,000,000                              
Debt Instrument, Interest Rate, Effective Percentage   1.25%                              
Term Loan Facility | Subsequent Event                                  
Debt Instrument                                  
Face amount $ 50,000,000                                
Proceeds from Issuance of Unsecured Debt $ 50,000,000                                
Term Loan Facility | Subsequent Event | Adjusted LIBOR                                  
Debt Instrument                                  
Debt Instrument, Basis Spread on Variable Rate 1.50%                                
Term Loan Facility | Subsidiary | Subsequent Event                                  
Debt Instrument                                  
Face amount         € 100,000,000 $ 109,000,000                      
[1] The fair value of our Senior Notes was determined using quoted prices in active markets for identical securities, which are considered Level 1 inputs. The fair value of our Senior Notes due 2021 was $640 million and $629 million as of March 31, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2023 was $565 million and $591 million as of March 31, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2026 was $533 million and $518 million as of March 31, 2020 and December 31, 2019, respectively. The fair value of our Senior Notes due 2046 was $400 million and $431 million as of March 31, 2020 and December 31, 2019, respectively.