Commitments and Contingencies (Details) $ in Millions |
1 Months Ended | 3 Months Ended | |
|---|---|---|---|
|
Sep. 30, 2014
USD ($)
|
Sep. 30, 2017
USD ($)
Class_Actions
|
Jun. 30, 2017
USD ($)
|
|
| Loss Contingencies [Line Items] | |||
| Loss Contingency, payment for SEC investigation | $ 29 | ||
| Macondo well incident | |||
| Loss Contingencies [Line Items] | |||
| BP Fault Apportionment in Macondo Ruling | 67.00% | ||
| Transocean Fault Apportionment In Macondo Ruling | 30.00% | ||
| Halliburton Fault Apportionment In Macondo Ruling | 3.00% | ||
| Loss Contingency, Settlement Agreement, Terms | $ 1,100 | ||
| Securities and related litigation | |||
| Loss Contingencies [Line Items] | |||
| Number Of Similar Class Action Lawsuits That Were Consolidated Into One Suit | Class_Actions | 20 | ||
| Litigation Settlement, Expense | $ 54 | ||
| Litigation Settlement, Amount Awarded to Other Party | $ 100 | ||