XML 64 R53.htm IDEA: XBRL DOCUMENT v3.5.0.2
Debt and Interest Expense - Debt Activity Table (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]  
Balance at December 31, 2015 $ 15,648
Other, net 28
Balance at June 30, 2016 15,653
Western Gas Partners, LP [Member]  
Debt Instrument [Line Items]  
Balance at December 31, 2015 2,691
Other, net 1
Balance at June 30, 2016 2,932
Western Gas Equity Partners, LP excluding WES [Member]  
Debt Instrument [Line Items]  
Balance at December 31, 2015 0 [1]
Other, net 0 [1]
Balance at June 30, 2016 28 [1]
Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Balance at December 31, 2015 12,957 [2]
Other, net 27 [2]
Balance at June 30, 2016 12,693 [2]
7.50% Tangible Equity Units [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes (17)
7.50% Tangible Equity Units [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes (17) [2]
Commercial Paper [Member]  
Debt Instrument [Line Items]  
Repayments, commercial paper (250)
Commercial Paper [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Repayments, commercial paper (250) [2]
4.850% Senior Notes Due 2021 [Member]  
Debt Instrument [Line Items]  
Issuances $ 794
Debt instrument, stated interest rate 4.85%
Debt instrument, maturity date Mar. 15, 2021
4.850% Senior Notes Due 2021 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Issuances $ 794 [2]
5.550% Senior Notes Due 2026 [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088
Debt instrument, stated interest rate 5.55%
Debt instrument, maturity date Mar. 15, 2026
5.550% Senior Notes Due 2026 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088 [2]
6.600% Senior Notes Due 2046 [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088
Debt instrument, stated interest rate 6.60%
Debt instrument, maturity date Mar. 15, 2046
6.600% Senior Notes Due 2046 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Issuances $ 1,088 [2]
364-Day Credit Facility Due 2017 [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 1,750
Repayments, credit facility (1,750)
364-Day Credit Facility Due 2017 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 1,750 [2]
Repayments, credit facility (1,750) [2]
WES RCF [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 530
Repayments, credit facility (290)
WES RCF [Member] | Western Gas Partners, LP [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 530
Repayments, credit facility (290)
WGP RCF [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 28
WGP RCF [Member] | Western Gas Equity Partners, LP excluding WES [Member]  
Debt Instrument [Line Items]  
Borrowings, credit facility 28 [1]
5.950% Senior Notes Due 2016 [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes $ (1,749)
Debt instrument, stated interest rate 5.95%
Debt instrument, maturity date Sep. 15, 2016
5.950% Senior Notes Due 2016 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes $ (1,749) [2]
Portion of 6.375% Senior Notes Due 2017 [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes (1,245)
Portion of 6.375% Senior Notes Due 2017 [Member] | Anadarko excluding WES and WGP [Member]  
Debt Instrument [Line Items]  
Repayments, senior notes $ (1,245) [2]
6.375% Senior Notes Due 2017 [Member]  
Debt Instrument [Line Items]  
Debt instrument, stated interest rate 6.375%
Debt instrument, maturity date Sep. 15, 2017
[1] Excludes WES.
[2] Excludes WES and WGP.