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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Tax expense | $ 19 |  | $ 36 | $ 52 | $ 106 |  |
Income before income taxes | 183 |  | 190 | 296 | 429 |  |
Favorable impact on income tax expense, discrete tax adjustments | 28 |  | $ 9 | 21 | $ 11 |  |
Foreign tax credits on dividends | 25 |  |  |  |  |  |
Transition tax expense (benefit) | (4) | $ 7 |  |  |  |  |
Provisional liability | 80 |  |  | 80 |  |  | $ 77
Provisional liability, increase (decrease) during period | (4) | $ 7 |  |  |  |  |
Provision for undistributed foreign earnings amount | $ 8 |  |  | $ 8 |  |  | 19
Tax credit carryforwards, foreign |  |  |  |  |  |  | $ 750
Scenario, Forecast |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Change in valuation allowance (up to) |  |  |  |  |  | $ 20 |

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