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Debt and Interest Expense - Debt Outstanding Table (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Debt Instrument [Line Items]      
Short-term debt, principal $ 8,128,000 $ 28,000,000  
Short-term debt, carrying value [1] 8,128,000 28,000,000 [2]  
Long-term debt, carrying value 7,730,502,000 4,787,381,000 [2]  
Valuation, Market Approach [Member] | Level-2 Inputs [Member]      
Debt Instrument [Line Items]      
Short-term debt, fair value 8,128,000 28,000,000  
Long Term Debt Obligations [Member]      
Debt Instrument [Line Items]      
Total long-term debt, principal 7,780,000,000 5,267,493,000  
Long-term debt, carrying value 7,730,502,000 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 7,566,248,000 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 [3] 8,128,000 0 [2]  
Long-term debt, carrying value 7,730,502,000 4,787,381,000 [2]  
WES Operating [Member] | Finance Lease Liability [Member]      
Debt Instrument [Line Items]      
Principal 8,128,000 0  
Short-term debt, carrying value 8,128,000 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 8,128,000 0  
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Principal 160,000,000 220,000,000  
Long-term debt, carrying value 160,000,000 220,000,000  
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 160,000,000 220,000,000  
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     2.83%
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 497,861,000 496,959,000  
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 $ 516,271,000 515,990,000  
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 669,260,000 669,078,000  
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 $ 678,551,000 662,109,000  
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 493,579,000 492,837,000  
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 $ 483,834,000 466,135,000  
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 496,074,000 495,710,000  
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 $ 494,665,000 483,994,000  
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 394,990,000 394,631,000  
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 $ 387,104,000 377,475,000  
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 396,101,000 395,841,000  
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 $ 394,121,000 384,370,000  
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 593,439,000 593,349,000  
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 $ 531,248,000 522,386,000  
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 686,793,000 686,648,000  
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 $ 608,994,000 605,327,000  
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 342,405,000 342,328,000  
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 $ 311,460,000 $ 311,536,000  
[1]
As of September 30, 2019, all amounts are considered affiliate. See Note 11.
[2]
Financial information has been recast to include the financial position and results attributable to AMA. See Note 1 and Note 3.
[3]
As of September 30, 2019, all amounts are considered affiliate. See Note 11.