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Commitments and Contingencies (Details)
0 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 32 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
Feb. 25, 2013
Feb. 19, 2013
Consent Decree
Dec. 31, 2012
Macondo well incident
USD ($)
claim
Sep. 30, 2013
Macondo well incident
USD ($)
item
claim
Jan. 03, 2013
Macondo well incident
USD ($)
Apr. 22, 2010
Macondo well incident
mi
person
Sep. 30, 2013
Macondo well incident
Economic loss
item
lawsuit
Jan. 31, 2013
Macondo well incident
Shareholder derivative claims
item
Jun. 30, 2010
Macondo well incident
Shareholder derivative claims
item
Dec. 15, 2010
Macondo well incident
U.S. Department of Justice claims
USD ($)
bbl
Apr. 30, 2013
Macondo well incident
State and other government claims
item
Apr. 20, 2013
Macondo well incident
State and other government claims
Jun. 21, 2010
Macondo well incident
State and other government claims
lawsuit
May 05, 2010
Macondo well incident
State and other government claims
item
Sep. 30, 2013
Macondo well incident
Wreck removal
USD ($)
Apr. 22, 2010
Macondo well incident
Insurance coverage
USD ($)
Sep. 30, 2013
Macondo well incident
Contractual indemnity
USD ($)
Sep. 30, 2013
Macondo well incident
Wrongful death and personal injury
item
Feb. 14, 2013
Macondo well incident
Plea Agreement
USD ($)
item
Sep. 30, 2013
Macondo well incident
Plea Agreement
USD ($)
Feb. 19, 2013
Macondo well incident
Consent Decree
Sep. 30, 2013
Macondo well incident
Consent Decree
USD ($)
Feb. 14, 2013
National Fish & Wildlife Foundation
Plea Agreement
USD ($)
Sep. 30, 2013
National Fish & Wildlife Foundation
Plea Agreement
USD ($)
Feb. 14, 2013
National Academy of Sciences
Plea Agreement
USD ($)
Sep. 30, 2013
National Academy of Sciences
Plea Agreement
USD ($)
Apr. 30, 2012
Brazil Frade field incident
USD ($)
Apr. 30, 2012
Brazil Frade field incident
BRL
Dec. 31, 2011
Brazil Frade field incident
USD ($)
Dec. 31, 2011
Brazil Frade field incident
BRL
Sep. 30, 2013
Brazil Frade field incident
lawsuit
Sep. 17, 2013
Brazil Frade field incident
USD ($)
subsidiary
Mar. 15, 2012
Brazil Frade field incident
m
km
Sep. 30, 2013
Brazil Frade field incident
Minimum
USD ($)
Sep. 30, 2013
Brazil Frade field incident
Maximum
USD ($)
Sep. 30, 2013
Asbestos litigation
USD ($)
plaintiff
lawsuit
subsidiary
Sep. 30, 2006
Rio de Janeiro tax assessment
USD ($)
subsidiary
Sep. 30, 2006
Rio de Janeiro tax assessment
BRL
Dec. 31, 2010
Brazilian import license assessment
USD ($)
Dec. 31, 2010
Brazilian import license assessment
BRL
Sep. 30, 2013
Hazardous waste disposal sites
subsidiary
Sep. 30, 2013
Retained risk
USD ($)
Sep. 30, 2013
Letters of credit and surety bonds
USD ($)
Dec. 31, 2012
Letters of credit and surety bonds
USD ($)
Contingencies                                                                                        
Number of persons declared dead           11                                                                            
Number of miles Deepwater Horizon was off coast of Louisiana           41                                                                            
Amount of fines, recoveries and civil penalties     $ 1,900,000,000 $ 451,000,000 $ 1,400,000,000                                                                              
Outstanding settlement obligations under the Plea Agreement and the Consent Decree, excluding interest                                                                                        
Amount paid for obligations under the Plea Agreement and Consent Decree including interest                                       160,000,000   404,000,000                                            
2014       460,000,000                               60,000,000   400,000,000                                            
2015       260,000,000                               60,000,000   200,000,000                                            
2016       60,000,000                               60,000,000                                                
2017       60,000,000                               60,000,000                                                
Total settlement obligations       840,000,000                               240,000,000   600,000,000                                            
Interest rate on civil penalty obligations (as a percent)                                           2.15%                                            
Performance plan approval period                                         120 days                                              
Performance period required for termination of decree   5 years                                                                                    
Minimum period for complied terms and provisions                                         12 months                                              
Number of subsidiaries that pled guilty to charges                                     1                                                  
Number of misdemeanor count of negligently discharging oil                                     1                                                  
Amount of Plea Agreement criminal fine                                     100,000,000                                                  
Payment of the criminal fine                                       100,000,000                                                
Initial payments                                               58,000,000   2,000,000                                    
Amount of required payment                                             150,000,000   150,000,000                                      
Probation period                                     5 years                                                  
Term of EPA Agreement 5 years                                                                                      
Portion of liability related to the rig explosion and fire incident recoverable from insurance     153,000,000 34,000,000                                                                                
Number of private civil lawsuits filed     3                                                                                  
Minimum number of litigation risk, if found grossly negligent       3                                                                                
Number of pending motions       4                                                                                
Number of actions or claims that were pending       1,387     921                                                         21                
Number of complaints that involve fatalities                                   9                                                    
Number of complaints that seek recovery for bodily injuries                                   63                                                    
Number of putative class action complaints filed alleging, among other things, economic losses as a result of environmental pollution arising out of the Macondo well incident (in lawsuits)             199                                                                          
Number of classes certified             0                                                                          
Percentage of non-operating interest of Anadarko in the Macondo well       25.00%                                                                                
Percentage of non-operating interest of MOEX in the Macondo well       10.00%                                                                                
Number of shareholders derivative suits                 2                                                                      
Number of plaintiffs who refiled complaint               1                                                                        
Civil penalties per barrel, Maximum (in dollars per barrel)                   1,100                                                                    
Civil penalties per barrel for gross negligence or willful misconduct, Maximum (in dollars per barrel)                   4,300                                                                    
U.S. government's maximum estimate of barrels of oil discharged and subject to penalties                   4,100,000                                                                    
Number of state, local and foreign governments who have filed lawsuits                     200                                                                  
Number of Gulf Coast states Attorneys General seeking recovery of clean up costs and damages                           5                                                            
Number of Atlantic Coast states Attorneys General wanting assurances of financial responsibility for potential damages                         11                                                              
Period of statute of limitations                       3 years                                                                
Percentage of asset value covered                             25.00%                                                          
Asset value covered by wreck removal insurance                             140,000,000                                                          
Insured status under excess liability insurance program                               950,000,000                                                        
Deductible amount under excess liability insurance program                               15,000,000                                                        
Amount covered by self insured layer of excess liability insurance program                               50,000,000                                                        
Amount covered by first layer of excess liability insurance program                               150,000,000                                                        
Amount covered by second layer of excess liability insurance program                               150,000,000                                                        
Amount covered by fourth layer of excess liability insurance program                               200,000,000                                                        
Amount covered by third layer of excess liability insurance program                               200,000,000                                                        
Amount covered by fifth layer of excess liability insurance program                               250,000,000                                                        
Amount agreed to indemnify and defend operator of rig                                 15,000,000                                                      
Amount sought under civil public action                                                     9,000,000,000 20,000,000,000 9,000,000,000 20,000,000,000       12,000 35,000                  
Number of subsidiaries entered into Frade Settlement Agreement                                                               1                        
Financial obligation under Frade Settlement Agreement                                                               0                        
Number of private lawsuits that allege moral damages                                                             230                          
Area of fissure of which seepage is noted                                                                 800                      
Distance from the November incident                                                                 3                      
Number of claimants                                                                       769                
Number of pending separate lawsuits remained, each with a single plaintiff                                                                       593                
Number of total cases in which there may be a direct or indirect interest regarding asbestos litigation (in lawsuits)                                                                       20                
Number of cases being governed for discovery and trial setting and in which the company has interest                                                                       20                
Number of cases scheduled for trial in which the company has interest                                                                       2                
Number of cases being governed for discovery and trial setting, in which the Company has an interest resolved                                                                       2                
Number of cases remaining after resolution, being governed for discovery and trial setting, in which the company has interest                                                                       18                
Number of cases in which ruling has now been obtained and the Company cannot be sued for punitive damages                                                                       3                
Number of cases gone to trial against defendants who allegedly manufactured or distributed drilling mud additives                                                                       7                
Number of cases filed in Louisiana in which subsidiaries of the company are named as defendants                                                                       11                
Number of subsidiaries name as defendants for cases filed in Louisiana                                                                       1                
Number of subsidiaries involved in lawsuits arising from design, construction and refurbishment of major industrial complexes                                                                       1                
Number of cases dismissed through early motions in which subsidiaries of the company were named as defendants                                                                       4                
Number of pending claims in which subsidiaries of the company are named as defendants                                                                       7                
Number of lawsuits alleging personal injury from asbestos exposure for subsidiary involved in design, construction and refurbishment of major industrial complexes                                                                       883                
Estimated number of plaintiffs in lawsuits alleging personal injury from asbestos exposure for subsidiary involved in design, construction and refurbishment of major industrial complexes                                                                       1,873                
Insurance limits potentially available for damages in lawsuits regarding personal injury from asbestos exposure for subsidiary involved in design, construction and refurbishment of major industrial                                                                       1,000,000,000                
Tax assessment from state tax authorities                                                                         231,000,000 513,000,000 230,000,000 509,000,000        
Number of subsidiaries involved in tax assessment relating to import license                                                                         1 1            
Total amount of tax assessment from state tax authorities                                                                             14,000,000 31,000,000        
Percentage of liability for remediation and related costs                                                                                 8.00%      
Number of subsidiaries ordered by California Regional Water Quality Control Board to develop testing plan for Alhambra, California site                                                                                 1      
Minimum number of subsidiaries likely to be named potentially responsible party by US Environmental Protection Agency for superfund site (in counts)                                                                                 1      
Aggregate value of drilling rig fleet                                                                                   27,300,000,000    
Maximum liability amount for well control and re-drilling liability related to blowouts                                                                                   50,000,000    
Per occurrence insurance deductible on hull and machinery                                                                                   125,000,000    
Maximum aggregate insurance deductible on hull and machinery per year                                                                                   200,000,000    
Maximum percentage of asset insured value covered by damage mitigation insurance                                                                                   50.00%    
Commercial market excess liability coverage                                                                                   820,000,000    
Per occurrence deductible on crew personal injury liability and collision liability claims                                                                                   10,000,000    
Per occurrence deductible on other third-party non-crew claims                                                                                   5,000,000    
Aggregate per occurrence deductible on other third party non-crew claims                                                                                   50,000,000    
Liability loss limit for commercial market excess liability coverage                                                                                   870,000,000    
Additional insurance that covers expenses that would otherwise be assumed by the well owner                                                                                   100,000,000    
Outstanding letters of credit                                                                                     529,000,000 522,000,000
Letters of credit issued under committed and uncommitted credit lines                                                                                     103,000,000 113,000,000
Surety bonds outstanding                                                                                     $ 8,000,000 $ 11,000,000