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Debt (Narrative) (Details)
1 Months Ended 12 Months Ended
Sep. 06, 2019
USD ($)
Oct. 31, 2017
USD ($)
May 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
agreement
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Oct. 15, 2019
Sep. 13, 2019
USD ($)
Jul. 30, 2019
USD ($)
Debt Instrument [Line Items]                  
Repayments of principal, 2020       $ 25,000,000          
Repayments of principal, 2021       50,000,000          
Repayments of principal, 2022       297,000,000          
Debt at face value       475,000,000          
Short-term debt       25,000,000 $ 50,000,000        
Credit Agreement                  
Letters of credit outstanding       1,000,000          
Repayments of debt       $ 1,286,000,000 575,000,000 $ 2,152,000,000      
Revolving credit facility due January 2019 and October 2021 at weighted-average rate of 3.669% at year-end 2018                  
Credit Agreement                  
Number or renewals available to extend the term of the credit agreement | agreement       2          
Note payable term, in years       1 year          
Revolving credit facility       $ 0 125,000,000        
Credit facility       $ 0 $ 125,000,000        
Debt to EBITDA, ratio       5.0          
Debt to EBITDA, acquisitions, ratio       5.5          
Credit Agreement | Revolving credit facility due January 2019 and October 2021 at weighted-average rate of 3.669% at year-end 2018                  
Credit Agreement                  
Revolving credit agreement borrowing capacity                 $ 750,000,000
Maximum borrowing capacity under option                 1,000,000,000
3.750% Senior Notes Due March 1, 2028                  
Debt Instrument [Line Items]                  
Senior notes   $ 500,000,000              
Interest rate, stated percentage   3.75%              
4.680% Senior Notes Due February 15, 2045                  
Debt Instrument [Line Items]                  
Senior notes   $ 150,000,000              
Interest rate, stated percentage   4.68%              
Tax-exempt bonds due April 2020 and April 2021, at 1.850% and 1.885% at December 31, 2019, and 2018, respectively                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage       1.85% 1.885%        
Credit Agreement                  
Long-term debt, gross       $ 75,000,000 $ 75,000,000        
Line of Credit | Revolving credit facility due January 2019 and October 2021 at weighted-average rate of 3.669% at year-end 2018                  
Credit Agreement                  
Repayments of debt       125,000,000          
Line of Credit | Term Loan Facility Due March 20, 2020                  
Credit Agreement                  
Revolving credit agreement borrowing capacity                 $ 400,000,000
Senior Notes                  
Debt Instrument [Line Items]                  
Senior notes $ 900,000,000 $ 650,000,000   $ 900,000,000          
Short-term debt               $ 400,000,000  
Proceeds from debt, net of issuance costs 892,000,000 $ 643,000,000              
Senior Notes | 2.646% Senior Notes due February 2020                  
Debt Instrument [Line Items]                  
Interest rate, stated percentage       2.646%     2.646%    
Credit Agreement                  
Long-term debt, gross       $ 0 300,000,000        
Repayments of debt       300,000,000          
Senior Notes | 2.450% Senior Notes Due December 15, 2024                  
Debt Instrument [Line Items]                  
Senior notes $ 300,000,000                
Interest rate, stated percentage 2.45%                
Senior Notes | 3.150% Senior Notes Due December 15, 2029                  
Debt Instrument [Line Items]                  
Senior notes $ 600,000,000                
Interest rate, stated percentage 3.15%                
Notes Payable                  
Credit Agreement                  
Repayments of debt     $ 136,000,000            
Fair Value, Inputs, Level 2 | Municipal Bonds And Line Of Credits                  
Debt Instrument [Line Items]                  
Debt, fair value       75,000,000 200,000,000        
Fair Value, Inputs, Level 2 | Senior Notes                  
Debt Instrument [Line Items]                  
Debt, fair value       3,650,000,000 2,660,000,000        
Bakken Pipeline and MSLP Acquisition | Tax-exempt bonds due April 2020 and April 2021, at 1.850% and 1.885% at December 31, 2019, and 2018, respectively                  
Debt Instrument [Line Items]                  
Repayments of principal, 2020       25,000,000          
Repayments of principal, 2021       50,000,000          
Credit Agreement                  
Long-term debt, gross       $ 25,000,000          
Repayments of long-term debt         $ 25,000,000