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Debt and Interest Expense - Debt Outstanding Table (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total long-term debt principal $ 2,720,000,000 $ 2,430,000,000
Carrying value 2,707,357,000 2,422,954,000 [1]
Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]    
Debt Instrument [Line Items]    
Fair value [2] 2,492,466,000 2,511,253,000
Anadarko [Member]    
Debt Instrument [Line Items]    
WGP working capital facility - Anadarko 0 1,150,000 [1]
Anadarko [Member] | Working Capital Facility [Member]    
Debt Instrument [Line Items]    
Principal 0 1,150,000
WGP working capital facility - Anadarko 0 1,150,000
Anadarko [Member] | Working Capital Facility [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]    
Debt Instrument [Line Items]    
Fair value [2] 0 1,150,000
Western Gas Partners, LP [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Principal 300,000,000 510,000,000
Carrying value 300,000,000 510,000,000
Western Gas Partners, LP [Member] | Revolving Credit Facility [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]    
Debt Instrument [Line Items]    
Fair value [2] 300,000,000 510,000,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member]    
Debt Instrument [Line Items]    
Principal 500,000,000 500,000,000
Carrying value 496,285,000 495,714,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]    
Debt Instrument [Line Items]    
Fair value [2] 513,645,000 549,530,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member]    
Debt Instrument [Line Items]    
Principal 670,000,000 670,000,000
Carrying value 672,572,000 672,930,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]    
Debt Instrument [Line Items]    
Fair value [2] 595,744,000 681,942,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 2.600% Senior Notes due 2018 [Member]    
Debt Instrument [Line Items]    
Principal 350,000,000 350,000,000
Carrying value 350,348,000 350,474,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 2.600% Senior Notes due 2018 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]    
Debt Instrument [Line Items]    
Fair value [2] 339,293,000 352,162,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member]    
Debt Instrument [Line Items]    
Principal 400,000,000 400,000,000
Carrying value 393,923,000 393,836,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]    
Debt Instrument [Line Items]    
Fair value [2] 321,499,000 417,619,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member]    
Debt Instrument [Line Items]    
Principal 500,000,000 0
Carrying value 494,229,000 0
Western Gas Partners, LP [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]    
Debt Instrument [Line Items]    
Fair value [2] $ 422,285,000 $ 0
[1] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.
[2] Fair value is measured using the market approach and Level 2 inputs.