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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent |  |  | 90.00% | 12.00% | 0.00% |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | 10.00% | 10.00% | (5.00%) |
Effective Income Tax Rate Reconciliation Withholding Tax Reversals |  |  | 0.00% | 31.00% | 3.00% |
Deferred Tax Liabilities, Undistributed Foreign Earnings |  |  | $ 0 |  |  |
Undistributed Earnings of Foreign Subsidiaries |  |  | $ 4,000,000,000 |  |  |
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent |  |  | 0.00% | (46.00%) | 5.00% |
Effective tax rate |  |  | 128.00% | 17.00% | 42.00% |
Increase (decrease) in valuation allowance |  |  | $ (112,000,000) | $ (18,000,000) |  |
Valuation allowance |  |  | 988,000,000 | 876,000,000 |  |
Tax benefits related to tax status of operations in countries subject to reduced tax rates |  |  | 26,000,000 | 20,000,000 | $ 21,000,000 |
Income tax expense |  |  | $ (990,000,000) | $ (32,000,000) | $ (412,000,000) |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 35.00% | 35.00% | 35.00% |
Tax benefits related to tax status of operations in countries subject to reduced tax rates per share (in dollars per share) |  |  | $ 0.03 | $ 0.02 | $ 0.02 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued: |  |  |  |  |  |
Interest on income taxes accrued |  |  | $ 7,000,000 | $ 6,000,000 |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued |  |  | 0 | 0 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense: |  |  |  |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense |  |  | 1,000,000 | 2,000,000 | $ 2,000,000 |
Unrecognized Tax Benefits, Income Tax Penalties Expense |  |  | 0 | 0 | 0 |
Uncertain Tax Positions Additional Disclosures: |  |  |  |  |  |
Unrecognized tax benefits |  |  | 348,000,000 | 352,000,000 | 364,000,000 | $ 384,000,000
Unrecognized tax benefits that would impact effective tax rate |  |  | 332,000,000 | 332,000,000 | 343,000,000 |
Unrecognized tax benefits that would impact effective tax rate portion with attributes warranting full valuation allowance |  |  | 29,000,000 | 24,000,000 | 24,000,000 |
Unrecognized Tax benefits Anticipated To Result In Ne Decrease of Unrecognized Tax Benefits WIthin 12 Months of Balance Sheet Date Minimum |  |  | 5,000,000 |  |  |
Unrecognized tax benefits anticipated to result in net decrease of unrecognized tax benefits within 12 months, maximum |  |  | 15,000,000 |  |  |
Federal |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 1,900,000,000 |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 9,300,000,000 |  |  |
Foreign Tax Authority |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Operating loss carryforwards |  |  | 2,800,000,000 |  |  |
General Business Tax Credit Carryforward |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Tax credit carryforward |  |  | 21,000,000 |  |  |
Federal Alternative Minimum Tax |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Tax credit carryforward |  |  | 5,000,000 |  |  |
Foreign Jurisdictions |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Tax credit carryforward |  |  | 28,000,000 |  |  |
2021 Expiration | Foreign Jurisdictions |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Tax credit carryforward |  |  | 18,000,000 |  |  |
Year 2023 to 2028 [Member] | Foreign Jurisdictions |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Tax credit carryforward |  |  | 1,000,000 |  |  |
No Expiration |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Tax credit carryforward |  |  | 9,000,000 |  |  |
VIET NAM |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Income tax expense |  |  | $ (13,000,000) | $ (15,000,000) | $ (8,000,000) |
Tax benefits related to tax status of operations in countries subject to reduced tax rates per share (in dollars per share) |  |  |  | $ 0.01 | $ 0.01 |
Chilean tax reform Member [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective tax rate | 25.00% |  | 25.50% |  |  |
Other Tax Expense (Benefit) | $ 26,000,000 |  |  |  |  |
Subsequent Event [Member] | Chilean tax reform Member [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective tax rate |  | 27.00% |  |  |  |
UNITED STATES |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent |  |  | 88.00% |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  | 5.00% |  |  |
Income tax expense |  |  | $ (714,000,000) |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  | $ 39,000,000 |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  | $ 675,000,000 |  |  |
ARGENTINA |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent |  |  | 3.00% |  |  |
Effective tax rate |  |  | 35.00% |  |  |
Income tax expense |  |  | $ 0 |  |  |
ARGENTINA | FY 2018 - 2019 [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective tax rate |  |  | 30.00% |  |  |
ARGENTINA | FY 2020 and beyond [Member] |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective tax rate |  |  | 25.00% |  |  |
Cash, Restricted Cash, Unbilled Receivables, and Other Liquid Assets [Member] | UNITED STATES |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective tax rate |  |  | 15.50% |  |  |
Non-cash [Member] | UNITED STATES |  |  |  |  |  |
Income Tax Disclosures [Line Items] |  |  |  |  |  |
Effective tax rate |  |  | 8.00% |  |  |

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