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Commitments and Contingencies (Cont) (Details) $ in Millions |  |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 29, 2015 USD ($) item | Jan. 03, 2013 USD ($) item | Nov. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Aug. 31, 2015 USD ($) | Oct. 31, 2007 subsidiary | Sep. 30, 2018 USD ($) plaintiff lawsuit installment subsidiary | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Nov. 28, 2017 USD ($)
7.00% Notes due June 2028 |  |  |  |  |  |  |  |  |  |
Other legal proceedings |  |  |  |  |  |  |  |  |  |
Debt instrument interest rate stated percentage |  |  |  |  |  |  | 7.00% |  |  |
Macondo well incident |  |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |  |
Amount of fines, recoveries and civil penalties |  |  |  |  |  |  | $ 217 |  | $ 219 |
PSC Settlement Agreement |  |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |  |
Settlement Agreement | $ 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% |  |  |  |  |  |  |  |  |
Cash payment into an escrow account pending approval by MDL Court |  |  |  | $ 25 | $ 212 |  |  |  |  |
Number of claimants | item | 30 |  |  |  |  |  |  |  |  |
Payment of contingency accrual |  |  | $ 25 |  |  |  |  |  |  |
Number of installment | installment |  |  |  |  |  |  | 3 |  |  |
Escrow Deposit |  |  |  |  |  |  | $ 214 |  | $ 212 |
PSC Settlement Agreement Legal Fees |  |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |  |
Settlement Agreement | $ 25 |  |  |  |  |  |  |  |  |
Plea Agreement |  |  |  |  |  |  |  |  |  |
Contingencies |  |  |  |  |  |  |  |  |  |
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 |  |
Other legal proceedings |  |  |  |  |  |  |  |  |  |
Number of subsidiaries | item |  | 1 |  |  |  |  |  |  |  |
Asbestos litigation |  |  |  |  |  |  |  |  |  |
Other legal proceedings |  |  |  |  |  |  |  |  |  |
Number of claims | lawsuit |  |  |  |  |  |  | 141 |  |  |
Number of subsidiaries | subsidiary |  |  |  |  |  |  | 1 |  |  |
Asbestos litigation | LA |  |  |  |  |  |  |  |  |  |
Other legal proceedings |  |  |  |  |  |  |  |  |  |
Number of claims | plaintiff |  |  |  |  |  |  | 9 |  |  |
Nigerian Cabotage Act litigation |  |  |  |  |  |  |  |  |  |
Other legal proceedings |  |  |  |  |  |  |  |  |  |
Number of subsidiaries | 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% |  |  |  |
Global Marine Litigation | 7.00% Notes due June 2028 |  |  |  |  |  |  |  |  |  |
Other legal proceedings |  |  |  |  |  |  |  |  |  |
Debt instrument face value |  |  |  |  |  |  |  |  |  | $ 300
Debt instrument interest rate stated percentage |  |  |  |  |  |  |  |  |  | 7.00%
Nigerian customer arbitration |  |  |  |  |  |  |  |  |  |
Other legal proceedings |  |  |  |  |  |  |  |  |  |
Uncertain collectability of drilling service receivable |  |  |  |  |  |  | $ 80 |  |  |
Hazardous waste disposal sites |  |  |  |  |  |  |  |  |  |
Other legal proceedings |  |  |  |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  |  |  |  |  |  | 1 |  |  |
Percentage of liability for remediation and related costs |  |  |  |  |  |  | 8.00% |  |  |
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 |  |  |

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