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Income Taxes Uncertain tax positions (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Unrecognized Tax Benefits | $ 11 | $ 38 | $ 41 | $ 40
Tax positions taken in current year | 1 | 1 | 1 |
Tax positions taken in prior years | 1 | 0 | 1 |
Tax positions taken in current year | 0 | 0 | 0 |
Tax positions taken in prior years | 0 | 0 | 0 |
Settlements during the year | 0 | (4) | (1) |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 29 | 0 | $ 0 |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 11 |  |  |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued |  | 1 |  |
Unrecognized Tax Benefits, Interest on Income Taxes Expense |  | $ 2 |  |

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