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Income Taxes (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 23, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2014
Income Taxes [Abstract] |  |  |  |
Income tax provision |  | $ (2) | $ (12) |
Loss before income taxes |  | $ (36) | $ (82) |
Effective tax rate |  | (6.00%) | (15.00%) |
Positive Outcome of Litigation [Member] | Settled Litigation [Member] | Anadarko Litigation [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Settlement amount paid | $ 5,200 |  |  | $ 5,200
Interest accrued on the settlement | $ 65 |  |  |
Deferred tax assets |  |  |  | $ 2,000
Trust expenditures expected from litigation proceeds |  | $ 2,800 |  |
Trusts and Other Governmental Entities [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Percentage of settlement to be received from judgment |  | 88.00% |  |
Tort Trust [Member] |  |  |  |
Gain Contingencies [Line Items] |  |  |  |
Percentage of settlement to be received from judgment |  | 12.00% |  |
Australia [Member] |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory tax rate |  |  | 30.00% |
South Africa [Member] |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory tax rate |  | 28.00% |  |
Netherlands [Member] |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory tax rate |  | 25.00% |  |
United Kingdom [Member] |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory tax rate |  | 20.00% |  |
U.S. Federal [Member] |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory tax rate |  | 35.00% |  |
Switzerland [Member] |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory tax rate |  | 8.50% |  |
Jersey, U.K. [Member] |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory tax rate |  | 0.00% |  |

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