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Debt and Interest Expense - Debt Outstanding Table (Details) - USD ($)
Mar. 31, 2020
Jan. 13, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Short-term debt, principal $ 11,184,000   $ 7,873,000
Short-term debt, carrying value [1] 11,184,000   7,873,000
Long-term debt, carrying value 8,088,761,000   7,951,565,000
Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Short-term debt, fair value 11,184,000   7,873,000
Long-Term Debt Obligations [Member]      
Debt Instrument [Line Items]      
Total long-term debt, principal 8,173,990,000   8,000,000,000
Long-term debt, carrying value 8,088,761,000   7,951,565,000
Long-Term Debt Obligations [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value 4,026,415,000   7,849,818,000
WES Operating [Member]      
Debt Instrument [Line Items]      
Short-term debt, carrying value [2] 11,184,000   7,873,000
Long-term debt, carrying value 8,088,761,000   7,951,565,000
WES Operating [Member] | Finance Lease Liability, Short Term [Member]      
Debt Instrument [Line Items]      
Principal 11,184,000   7,873,000
Short-term debt, carrying value 11,184,000   7,873,000
WES Operating [Member] | Finance Lease Liability, Short Term [Member] | Affiliates [Member]      
Debt Instrument [Line Items]      
Short-term debt, carrying value 2,600,000   7,900,000
WES Operating [Member] | Finance Lease Liability, Short Term [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Short-term debt, fair value 11,184,000   7,873,000
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Principal 125,000,000   380,000,000
Long-term debt, carrying value 125,000,000   380,000,000
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value 125,000,000   380,000,000
WES Operating [Member] | Term Loan Facility [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Principal 0   3,000,000,000
Long-term debt, carrying value 0   3,000,000,000
WES Operating [Member] | Term Loan Facility [Member] | Revolving Credit Facility [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value 0   3,000,000,000
WES Operating [Member] | Finance Lease Liability, Long Term [Member]      
Debt Instrument [Line Items]      
Principal 28,990,000   0
Long-term debt, carrying value 28,990,000   0
WES Operating [Member] | Finance Lease Liability, Long Term [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Long-term debt, fair value $ 28,990,000   0
WES Operating [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.375%    
Principal $ 438,631,000   500,000,000
Long-term debt, carrying value 437,300,000   498,168,000
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]      
Long-term debt, fair value $ 352,437,000   515,042,000
WES Operating [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.00%    
Principal $ 631,369,000   670,000,000
Long-term debt, carrying value 630,790,000   669,322,000
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]      
Long-term debt, fair value 408,183,000   689,784,000
WES Operating [Member] | Senior Notes [Member] | Floating-Rate Senior Notes due 2023 [Member]      
Debt Instrument [Line Items]      
Principal 300,000,000   0
Long-term debt, carrying value 298,118,000   0
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 $ 158,400,000   0
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 $ 1,000,000,000   0
Long-term debt, carrying value 991,713,000   0
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 $ 509,618,000   0
WES Operating [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 3.95%    
Principal $ 500,000,000   500,000,000
Long-term debt, carrying value 494,086,000   493,830,000
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 $ 254,103,000   504,968,000
WES Operating [Member] | Senior Notes [Member] | 4.650% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.65%    
Principal $ 500,000,000   500,000,000
Long-term debt, carrying value 496,323,000   496,197,000
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 $ 258,950,000   513,393,000
WES Operating [Member] | Senior Notes [Member] | 4.500% Senior Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.50%    
Principal $ 400,000,000   400,000,000
Long-term debt, carrying value 395,236,000   395,113,000
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 $ 191,693,000   390,920,000
WES Operating [Member] | Senior Notes [Member] | 4.750% Senior Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.75%    
Principal $ 400,000,000   400,000,000
Long-term debt, carrying value 396,280,000   396,190,000
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 $ 189,498,000   400,962,000
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 $ 1,200,000,000   0
Long-term debt, carrying value 1,188,718,000   0
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 $ 500,911,000   0
WES Operating [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.45%    
Principal $ 600,000,000   600,000,000
Long-term debt, carrying value 593,501,000   593,470,000
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 $ 224,905,000   533,710,000
WES Operating [Member] | Senior Notes [Member] | 5.300% Senior Notes due 2048 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.30%    
Principal $ 700,000,000   700,000,000
Long-term debt, carrying value 686,893,000   686,843,000
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 $ 277,851,000   610,841,000
WES Operating [Member] | Senior Notes [Member] | 5.500% Senior Notes due 2048 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.50%    
Principal $ 350,000,000   350,000,000
Long-term debt, carrying value 342,459,000   342,432,000
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 $ 132,332,000   310,198,000
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 $ 1,000,000,000   0
Long-term debt, carrying value 983,354,000   0
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 $ 413,544,000   $ 0
[1]
Short-term debt includes related-party amounts for finance leases of $2.6 million and $7.9 million as of March 31, 2020, and December 31, 2019, respectively.
[2]
Short-term debt includes related-party amounts for finance leases of $2.6 million and $7.9 million as of March 31, 2020, and December 31, 2019, respectively.