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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income taxes |  |  |  |  |
Effective tax rate on income from continuing operations (as a percent) | 18.80% | 23.50% | 17.10% | 17.40% |
Valuation allowance | $ 15 |  | $ 15 |  | $ 15
Gross unrecognized tax benefits | 126 |  | 126 |  | 110
Unrecognized tax benefits, net of federal tax benefits, that would affect the effective tax rate if recognized | 95 |  | 95 |  | 80
Increase in interest and penalties | 0 | $ 1 |  | $ 2 |
Decrease in interest and penalties |  |  | 1 |  |
Payable related to accrued interest and penalties | 9 |  | 9 |  | $ 10
Minimum |  |  |  |  |
Income taxes |  |  |  |  |
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months | 40 |  | 40 |  |
Maximum |  |  |  |  |
Income taxes |  |  |  |  |
Amount of decrease in unrecognized tax benefits reasonably possible within next 12 months | 50 |  | 50 |  |
State |  |  |  |  |
Income taxes |  |  |  |  |
Deferred tax assets, loss carryforwards | 16 |  | 16 |  |
Valuation allowance, net operating losses | 12 |  | 12 |  |
Valuation allowance | 2 |  | 2 |  |
Foreign |  |  |  |  |
Income taxes |  |  |  |  |
Valuation allowance | $ 1 |  | $ 1 |  |

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