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Debt and Interest Expense - Debt Outstanding Table (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Debt Instrument [Line Items]      
Short-term debt, principal $ 2,000,000,000 $ 28,000,000  
Short-term debt, carrying value 2,000,000,000 28,000,000 [1]  
Long-term debt, carrying value 5,208,411,000 4,787,381,000 [1]  
Valuation, Market Approach [Member] | Level 2 Inputs [Member]      
Debt Instrument [Line Items]      
Short-term debt, fair value [2] 2,000,000,000 28,000,000  
Long Term Debt Obligations [Member]      
Debt Instrument [Line Items]      
Total long-term debt, principal 5,260,000,000 5,267,493,000  
Long-term debt, carrying value 5,208,411,000 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 [2] 5,227,532,000 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 [2] 0 28,000,000  
WES Operating [Member]      
Debt Instrument [Line Items]      
Short-term debt, carrying value 2,000,000,000 0 [1]  
Long-term debt, carrying value 5,208,411,000 4,787,381,000 [1]  
WES Operating [Member] | WES 364-Day Facility [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Principal 2,000,000,000 0  
Short-term debt, carrying value 2,000,000,000 0  
WES Operating [Member] | WES 364-Day Facility [Member] | Revolving Credit Facility [Member] | Valuation, Market Approach [Member] | Level 2 Inputs [Member]      
Debt Instrument [Line Items]      
Short-term debt, fair value [2] 2,000,000,000 0  
WES Operating [Member] | RCF [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Principal 640,000,000 220,000,000  
Long-term debt, carrying value 640,000,000 220,000,000  
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 [2] 640,000,000 220,000,000  
WES Operating [Member] | APCWH Note Payable [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate     2.54%
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 [2] $ 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%    
Debt instrument, maturity date Jun. 01, 2021    
Principal $ 500,000,000 500,000,000  
Long-term debt, carrying value 497,257,000 496,959,000  
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 [2] $ 518,755,000 515,990,000  
WES Operating [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.00%    
Debt instrument, maturity date Jul. 01, 2022    
Principal $ 670,000,000 670,000,000  
Long-term debt, carrying value 669,138,000 669,078,000  
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 [2] $ 680,293,000 662,109,000  
WES Operating [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 3.95%    
Debt instrument, maturity date Jun. 01, 2025    
Principal $ 500,000,000 500,000,000  
Long-term debt, carrying value 493,082,000 492,837,000  
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 [2] $ 493,788,000 466,135,000  
WES Operating [Member] | Senior Notes [Member] | 4.650% Senior Notes due 2026 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.65%    
Debt instrument, maturity date Jul. 01, 2026    
Principal $ 500,000,000 500,000,000  
Long-term debt, carrying value 495,830,000 495,710,000  
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 [2] $ 507,034,000 483,994,000  
WES Operating [Member] | Senior Notes [Member] | 4.500% Senior Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.50%    
Debt instrument, maturity date Mar. 01, 2028    
Principal $ 400,000,000 400,000,000  
Long-term debt, carrying value 394,749,000 394,631,000  
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 [2] $ 400,050,000 377,475,000  
WES Operating [Member] | Senior Notes [Member] | 4.750% Senior Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 4.75%    
Debt instrument, maturity date Aug. 15, 2028    
Principal $ 400,000,000 400,000,000  
Long-term debt, carrying value 395,928,000 395,841,000  
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 [2] $ 407,849,000 384,370,000  
WES Operating [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.45%    
Debt instrument, maturity date Apr. 01, 2044    
Principal $ 600,000,000 600,000,000  
Long-term debt, carrying value 593,378,000 593,349,000  
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 [2] $ 573,949,000 522,386,000  
WES Operating [Member] | Senior Notes [Member] | 5.300% Senior Notes due 2048 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.30%    
Debt instrument, maturity date Mar. 01, 2048    
Principal $ 700,000,000 700,000,000  
Long-term debt, carrying value 686,696,000 686,648,000  
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 [2] $ 664,278,000 605,327,000  
WES Operating [Member] | Senior Notes [Member] | 5.500% Senior Notes due 2048 [Member]      
Debt Instrument [Line Items]      
Senior note, interest rate 5.50%    
Debt instrument, maturity date Aug. 15, 2048    
Principal $ 350,000,000 350,000,000  
Long-term debt, carrying value 342,353,000 342,328,000  
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 [2] $ 341,536,000 $ 311,536,000  
[1] Financial information has been recast to include the financial position and results attributable to AMA. See Note 1 and Note 3.
[2] Fair value is measured using the market approach and Level 2 inputs.