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2418409 - Disclosure - Pension Plans, Other Postretirement Benefits, and Defined-Contribution Plans - Weighted-Average Assumptions for Benefit Obligations and Net Periodic Benefit Cost Table (Detail)
(http://www.anadarko.com/role/PensionPlansOtherPostretirementBenefitsAndDefinedContributionPlansWeightedAverageAssumptionsForBenefitObligationsAndNetPeriodicBenefitCostTableDetail)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Pension Plans, Defined Benefit [Member]Other Postretirement Benefit Plan [Member]Pension Plans, Defined Benefit [Member]Other Postretirement Benefit Plan [Member]Pension Plans, Defined Benefit [Member]Other Postretirement Benefit Plan [Member]
Discount rate
4.06%  
4.26%  
4.50%  
5.00%  
4.00%  
4.25%  
Rates of increase in compensation levels
5.40%  
5.48%  
5.25%  
5.50%  
5.25%  
5.25%  
Discount rate
4.62%  
5.00%  
4.00%  
4.25%  
4.75%  
5.25%  
Long-term rate of return on plan assets
6.77%  
 
6.75%  
 
6.75%  
 
Rates of increase in compensation levels
5.34%  
5.41%  
5.25%  
5.25%  
5.00%  
5.25%