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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Income taxes |  |  |  |  |
Effective tax rate on income from continuing operations (as a percent) | 23.50% | 15.40% | 17.40% | 15.80% |
Valuation allowance | $ 12 |  | $ 12 |  | $ 19
Gross unrecognized tax benefits | 111 |  | 111 |  | 100
Unrecognized tax benefits net of federal tax benefits that would affect the effective tax rate | 82 |  | 82 |  | 67
Increase in interest and penalties | 1 |  | 2 | $ 1 |
Decrease in interest and penalties |  | $ 1 |  |  |
Payable related to accrued interest and penalties | 10 |  | 10 |  | $ 8
Minimum [Member] |  |  |  |  |
Income taxes |  |  |  |  |
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months | 0 |  | 0 |  |
Maximum [Member] |  |  |  |  |
Income taxes |  |  |  |  |
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months | 10 |  | 10 |  |
State and Local [Member] |  |  |  |  |
Income taxes |  |  |  |  |
Deferred tax assets, loss carryforwards | 18 |  | 18 |  |
Valuation allowance, net operating losses | 10 |  | 10 |  |
Valuation allowance | $ 2 |  | $ 2 |  |

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