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Commitments and Contingencies (Cont) (Details)
BRL in Millions, $ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Mar. 08, 2017
claim
May 29, 2015
USD ($)
item
Jan. 03, 2013
USD ($)
item
Jun. 30, 2016
USD ($)
Aug. 31, 2015
USD ($)
Oct. 31, 2007
subsidiary
Jun. 30, 2017
USD ($)
claim
item
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2004
lawsuit
plaintiff
Jun. 30, 2017
BRL
lawsuit
subsidiary
item
plaintiff
Jun. 30, 2017
USD ($)
lawsuit
subsidiary
item
plaintiff
Apr. 22, 2010
USD ($)
item
Dec. 31, 2006
subsidiary
Macondo well incident                            
Contingencies                            
Amount of fines, recoveries and civil penalties                 $ 250     $ 244    
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  
Number of Bermuda Market Insurers | item             4              
Insurance proceeds received             $ 10   20          
Number of claims settled | claim             2              
Number of claims with adverse decisions | claim 1                          
Number of claims remaining | claim 2                          
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 outstanding under the Plea Agreement                 60          
Amount paid for obligations under the Plea Agreement and Consent Decree including interest     $ 400       $ 60 $ 60            
PSC Settlement Agreement                            
Contingencies                            
Settlement agreement subject to court approval   $ 212                        
Settlement, legal fees   $ 25                        
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   30                        
Cash payment into an escrow account pending approval by MDL Court       $ 25 $ 212                  
Escrow Deposit                 $ 237     $ 237    
Asbestos litigation | MS                            
Other legal proceedings                            
Number of actions or claims that were pending | lawsuit                   21        
Number of claimants | plaintiff                   769        
Number of pending separate lawsuits remained, each with a single plaintiff | item                     15 15    
Asbestos litigation | LA                            
Other legal proceedings                            
Number of pending separate lawsuits remained, each with a single plaintiff | plaintiff                     8 8    
Asbestos litigation | Wrongful death and personal injury                            
Other legal proceedings                            
Number of subsidiaries involved in lawsuits arising from design, construction and refurbishment of major industrial complexes | subsidiary                     1 1    
Number of lawsuits alleging personal injury from asbestos exposure for subsidiary involved in design, construction and refurbishment of major industrial complexes | lawsuit                     168 168    
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                     182 182    
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                     BRL 519 $ 157    
Number of subsidiaries involved in tax assessment relating to import license | subsidiary                           1
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% 8.00%    
Number of subsidiaries ordered by California Regional Water Quality Control Board to develop testing plan for Alhambra, California site | subsidiary                     1 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 1