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Debt and Interest Expense - Debt Outstanding Table (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Jan. 13, 2020
Debt Instrument [Line Items]      
Total short-term debt, principal $ 726,589 $ 439,345  
Total short-term debt, carrying value 726,429 438,870  
Long-term debt 6,399,874 7,415,832  
Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Short-term debt, fair value 734,586 444,505  
Long-Term Debt Obligations [Member]      
Debt Instrument [Line Items]      
Total long-term debt, principal 6,470,851 7,494,539  
Long-term debt 6,399,874 7,415,832  
Long-Term Debt Obligations [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value 7,204,317 7,845,524  
WES Operating [Member]      
Debt Instrument [Line Items]      
Total short-term debt, carrying value 726,429 438,870  
Long-term debt 6,399,874 7,415,832  
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Principal 220,000 0  
Short-term debt, carrying value 220,000 0  
WES Operating [Member] | RCF [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Short-term debt, fair value 220,000 0  
WES Operating [Member] | Finance Lease Liability, Short Term [Member]      
Debt Instrument [Line Items]      
Finance leases - short-term debt 4,343 8,264  
WES Operating [Member] | Finance Lease Liability, Short Term [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Finance leases - short-term debt 4,343 8,264  
WES Operating [Member] | Finance Lease Liability, Long Term [Member]      
Debt Instrument [Line Items]      
Finance leases - long-term debt 2,202 23,644  
WES Operating [Member] | Finance Lease Liability, Long Term [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Finance leases - long-term debt $ 2,202 23,644  
WES Operating [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.00%    
Principal $ 502,246 580,917  
Short-term debt, carrying value 502,086    
Long-term debt, carrying value   580,555  
WES Operating [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Short-term debt, fair value $ 510,243    
Long-term debt, fair value   597,568  
WES Operating [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.375%    
Principal $ 0 431,081  
Short-term debt, carrying value 0 430,606  
WES Operating [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Short-term debt, fair value 0 436,241  
WES Operating [Member] | Senior Notes [Member] | Floating-Rate Senior Notes due 2023 [Member]      
Debt Instrument [Line Items]      
Principal 213,138 239,978  
Long-term debt, carrying value 212,521 238,879  
WES Operating [Member] | Senior Notes [Member] | Floating-Rate Senior Notes due 2023 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 212,773 235,066  
WES Operating [Member] | Senior Notes [Member] | 3.100% Senior Notes due 2025 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 3.10%   3.10%
Principal $ 732,106 1,000,000  
Long-term debt, carrying value 727,794 992,900  
WES Operating [Member] | Senior Notes [Member] | 3.100% Senior Notes due 2025 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 774,328 1,028,614  
WES Operating [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 3.95%    
Principal $ 399,163 500,000  
Long-term debt, carrying value 395,708 494,866  
WES Operating [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 421,970 512,807  
WES Operating [Member] | Senior Notes [Member] | 4.650% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.65%    
Principal $ 474,242 500,000  
Long-term debt, carrying value 471,500 496,708  
WES Operating [Member] | Senior Notes [Member] | 4.650% Senior Notes due 2026 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 513,758 524,880  
WES Operating [Member] | Senior Notes [Member] | 4.500% Senior Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.50%    
Principal $ 400,000 400,000  
Long-term debt, carrying value 396,010 395,617  
WES Operating [Member] | Senior Notes [Member] | 4.500% Senior Notes due 2028 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 433,214 415,454  
WES Operating [Member] | Senior Notes [Member] | 4.750% Senior Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.75%    
Principal $ 400,000 400,000  
Long-term debt, carrying value 396,840 396,555  
WES Operating [Member] | Senior Notes [Member] | 4.750% Senior Notes due 2028 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 437,005 418,786  
WES Operating [Member] | Senior Notes [Member] | 4.050% Senior Notes due 2030 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.05%   4.05%
Principal $ 1,200,000 1,200,000  
Long-term debt, carrying value 1,190,102 1,189,407  
WES Operating [Member] | Senior Notes [Member] | 4.050% Senior Notes due 2030 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 1,324,159 1,342,996  
WES Operating [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.45%    
Principal $ 600,000 600,000  
Long-term debt, carrying value 593,699 593,598  
WES Operating [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 691,067 607,234  
WES Operating [Member] | Senior Notes [Member] | 5.300% Senior Notes due 2048 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.30%    
Principal $ 700,000 700,000  
Long-term debt, carrying value 687,210 687,048  
WES Operating [Member] | Senior Notes [Member] | 5.300% Senior Notes due 2048 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 807,613 694,172  
WES Operating [Member] | Senior Notes [Member] | 5.500% Senior Notes due 2048 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.50%    
Principal $ 350,000 350,000  
Long-term debt, carrying value 342,629 342,543  
WES Operating [Member] | Senior Notes [Member] | 5.500% Senior Notes due 2048 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 409,945 343,928  
WES Operating [Member] | Senior Notes [Member] | 5.250% Senior Notes due 2050 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.25%   5.25%
Principal $ 1,000,000 1,000,000  
Long-term debt, carrying value 983,659 983,512  
WES Operating [Member] | Senior Notes [Member] | 5.250% Senior Notes due 2050 [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 1,176,283 $ 1,100,375