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Debt and Interest Expense - Debt Outstanding Table (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Short-term debt, principal $ 7,873,000 $ 28,000,000
Short-term debt, carrying value [1] 7,873,000 28,000,000
Long-term debt, carrying value 7,951,565,000 4,787,381,000
Valuation, Market Approach [Member] | Level-2 Inputs [Member]    
Debt Instrument [Line Items]    
Short-term debt, fair value 7,873,000 28,000,000
Long-Term Debt Obligations [Member]    
Debt Instrument [Line Items]    
Total long-term debt, principal 8,000,000,000 5,267,493,000
Long-term debt, carrying value 7,951,565,000 5,214,874,000
Long-Term Debt Obligations [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]    
Debt Instrument [Line Items]    
Long-term debt, fair value 7,849,818,000 4,976,815,000
WES [Member] | WGP RCF [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Principal 0 28,000,000
Short-term debt, carrying value 0 28,000,000
WES [Member] | WGP RCF [Member] | Revolving Credit Facility [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]    
Debt Instrument [Line Items]    
Short-term debt, fair value 0 28,000,000
WES Operating [Member]    
Debt Instrument [Line Items]    
Short-term debt, carrying value [2] 7,873,000 0
Long-term debt, carrying value 7,951,565,000 4,787,381,000
WES Operating [Member] | Finance Lease Liability [Member]    
Debt Instrument [Line Items]    
Principal 7,873,000 0
Short-term debt, carrying value 7,873,000 0
WES Operating [Member] | Finance Lease Liability [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]    
Debt Instrument [Line Items]    
Short-term debt, fair value 7,873,000 0
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Principal 380,000,000 220,000,000
Long-term debt, carrying value 380,000,000 220,000,000
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 380,000,000 220,000,000
WES Operating [Member] | Term Loan Facility [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Principal 3,000,000,000 0
Long-term debt, carrying value 3,000,000,000 0
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 3,000,000,000 $ 0
WES Operating [Member] | APCWH Note Payable [Member]    
Debt Instrument [Line Items]    
Senior note, interest rate   3.04%
Principal 0 $ 427,493,000
Long-term debt, carrying value 0 427,493,000
WES Operating [Member] | APCWH Note Payable [Member] | Valuation, Market Approach [Member] | Level-2 Inputs [Member]    
Debt Instrument [Line Items]    
Long-term debt, fair value $ 0 427,493,000
WES Operating [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member]    
Debt Instrument [Line Items]    
Senior note, interest rate 5.375%  
Principal $ 500,000,000 500,000,000
Long-term debt, carrying value 498,168,000 496,959,000
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 $ 515,042,000 515,990,000
WES Operating [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member]    
Debt Instrument [Line Items]    
Senior note, interest rate 4.00%  
Principal $ 670,000,000 670,000,000
Long-term debt, carrying value 669,322,000 669,078,000
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 $ 689,784,000 662,109,000
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 493,830,000 492,837,000
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 $ 504,968,000 466,135,000
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 496,197,000 495,710,000
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 $ 513,393,000 483,994,000
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 395,113,000 394,631,000
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 $ 390,920,000 377,475,000
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 396,190,000 395,841,000
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 $ 400,962,000 384,370,000
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 593,470,000 593,349,000
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 $ 533,710,000 522,386,000
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 686,843,000 686,648,000
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 $ 610,841,000 605,327,000
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 342,432,000 342,328,000
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 $ 310,198,000 $ 311,536,000
[1]
As of December 31, 2019, all amounts are considered affiliate. See Note 14.
[2]
As of December 31, 2019, all amounts are considered affiliate. See Note 14.