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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Tax expense | $ 26 |  | $ 19 |  | $ 32 | $ 52 |
Income before income taxes | 82 |  | 183 |  | 44 | 296 |
Other adjustments, charges (benefits) | 6 | $ 7 | (28) | $ 7 | 13 | $ (21) |
Provisional income tax expense (benefit) |  |  | (4) |  |  |  |
Tax credit carryforwards, foreign | 637 |  |  |  | 637 |  |
Domestic Tax Authority |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Valuation allowance | 113 |  |  |  | 113 |  | $ 113
Foreign Tax Authority |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Valuation allowance | 233 |  |  |  | 233 |  | $ 204
Tax credit carryforward, valuation allowance | 103 |  |  |  | $ 103 |  |
Luxembourg |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Change in enacted tax rate, amount | $ 6 |  |  |  |  |  |
Japan and Singapore [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Other adjustments, charges (benefits) |  |  | $ (25) |  |  |  |

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