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Contingencies (Details)
$ / shares in Units, BRL in Millions, $ in Millions
 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 23, 2016
item
May 29, 2015
USD ($)
item
Feb. 25, 2013
Jan. 03, 2013
USD ($)
item
Jun. 30, 2016
USD ($)
Aug. 31, 2015
USD ($)
Jul. 31, 2015
USD ($)
Oct. 31, 2007
subsidiary
Sep. 30, 2016
USD ($)
lawsuit
item
plaintiff
subsidiary
Sep. 30, 2015
USD ($)
$ / shares
Dec. 31, 2004
lawsuit
plaintiff
Dec. 31, 2015
USD ($)
Sep. 30, 2014
Jul. 14, 2011
BRL
Jul. 14, 2011
USD ($)
Dec. 31, 2010
BRL
Apr. 22, 2010
USD ($)
item
Sep. 30, 2006
BRL
subsidiary
Macondo well incident                                    
Contingencies                                    
Income recognized in connection with settlement agreement                   $ 788                
Income recognized in connection with settlement agreement, net of tax                   $ 735                
Income recognized in connection with settlement agreement, diluted, (in dollars per share) | $ / shares                   $ 2.02                
Recoveries from insurance                   $ 538                
Settlement, legal fees                   125                
Decrease in other current liabilities from settlement of contingencies                   125                
Amount of fines, recoveries and civil penalties                 $ 250     $ 250            
Term of EPA Agreement     5 years                              
Percentage of fault assigned by the court                         30.00%          
Macondo well incident | Insurance coverage                                    
Contingencies                                    
Insured status under excess liability insurance program                                 $ 950  
Amount covered by first layer of excess liability insurance program                                 150  
Amount covered by second layer of excess liability insurance program                                 150  
Amount covered by third layer of excess liability insurance program                                 200  
Amount covered by fourth layer of excess liability insurance program                                 200  
Amount covered by fifth layer of excess liability insurance program                                 250  
Deductible amount under excess liability insurance program                                 15  
Amount covered by self insured layer of excess liability insurance program                                 $ 50  
Number of excess liability insurance coverage layers | item                                 4  
Macondo well incident | BP                                    
Contingencies                                    
Percentage of fault assigned by the court                         67.00%          
Macondo well incident | Halliburton                                    
Contingencies                                    
Percentage of fault assigned by the court                         3.00%          
Macondo well incident | BP                                    
Contingencies                                    
Cash proceeds from reimbursement of previously incurred losses             $ 125                      
Macondo well incident | Plea Agreement                                    
Contingencies                                    
Number of subsidiaries that pled guilty to charges | item       1                            
Number of misdemeanor count of negligently discharging oil | item       1                            
Amount paid for obligations under the Plea Agreement and Consent Decree including interest       $ 400         60 $ 60                
Amount of Plea Agreement criminal fine       100                            
Amount outstanding under the Plea Agreement                 60     120            
PSC Settlement Agreement                                    
Contingencies                                    
Settlement, legal fees   $ 25                                
Settlement agreement subject to court approval   $ 212                                
Number of classes of plaintiffs | item   2                                
Settlement allocated to Punitive Damage Class (as a percent)   72.80%                                
Settlement allocated to Assigned Claims Class (as a percent)   27.20%                                
Number of claimants opted out of settlement agreement | item 36                                  
Cash payment into an escrow account pending approval by MDL Court         $ 25 $ 212                        
Escrow Deposit                 $ 237     212            
National Fish & Wildlife Foundation | Plea Agreement                                    
Contingencies                                    
Amount of required payment       150                            
National Academy of Sciences | Plea Agreement                                    
Contingencies                                    
Amount of required payment       $ 150                            
Asbestos litigation | MS                                    
Contingencies                                    
Number of actions or claims that were pending | lawsuit                     21              
Other legal proceedings                                    
Number of pending separate lawsuits remained, each with a single plaintiff | plaintiff                     769              
Number of pending separate lawsuits remained, each with a single plaintiff | item                 15                  
Asbestos litigation | LA                                    
Other legal proceedings                                    
Number of pending separate lawsuits remained, each with a single plaintiff | plaintiff                 8                  
Asbestos litigation | Wrongful death and/or personal injury                                    
Other legal proceedings                                    
Number of subsidiaries involved in lawsuits arising from design, construction and refurbishment of major industrial complexes | subsidiary                 1                  
Number of lawsuits alleging personal injury from asbestos exposure for subsidiary involved in design, construction and refurbishment of major industrial complexes | lawsuit                 280                  
Estimated number of plaintiffs in lawsuits alleging personal injury from asbestos exposure for subsidiary involved in design, construction and refurbishment of major industrial complexes | plaintiff                 302                  
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                  
Rio de Janeiro tax assessment                                    
Other legal proceedings                                    
Tax assessment from state tax authorities                 145                 BRL 472
Number of subsidiaries involved in tax assessment relating to import license | subsidiary                                   1
Brazilian import license assessment                                    
Other legal proceedings                                    
Tax assessment from state tax authorities                 $ 188             BRL 613    
Total amount of tax assessment from state tax authorities                           BRL 40 $ 12      
Nigerian Cabotage Act litigation                                    
Other legal proceedings                                    
Number of subsidiaries that were served a Notice and Demand from the Nigeria Maritime Administration and Safety Agency (NIMASA) | subsidiary               3                    
Percentage of surcharge on the value of contracts performed in Nigeria pursuant to the Coastal and Inland Shipping (Cabotage) Act 2003 (the Cabotage Act)               2.00%                    
Hazardous waste disposal sites                                    
Other legal proceedings                                    
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 | subsidiary                 1                  
Hazardous waste disposal sites | Minimum                                    
Other legal proceedings                                    
Minimum number of subsidiaries likely to be named potentially responsible party by US Environmental Protection Agency for superfund site (in counts) | subsidiary                 1                  
Letters of credit and surety bonds                                    
Other legal proceedings                                    
Outstanding letters of credit                 $ 68     153            
Surety bonds outstanding                 $ 31     $ 30