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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Effective tax rate on income from continuing operations (as a percent) | (2.40%) | 16.10% | 18.00% | 16.00% |
Valuation allowance | $ 17 |  | $ 17 |  | $ 19
Gross unrecognized tax benefits | 102 |  | 102 |  | 100
Unrecognized tax benefits net of federal tax benefits that would affect the effective tax rate | 73 |  | 73 |  | 67
Increase (decrease) in interest and penalties | 1 | $ 1 | 1 | $ 2 |
Payable related to accrued interest and penalties | 9 |  | 9 |  | $ 8
Minimum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Decrease in gross unrecognized tax benefits due to resolution of audits and statute expirations | 0 |  | 0 |  |
Maximum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Decrease in gross unrecognized tax benefits due to resolution of audits and statute expirations | 10 |  | 10 |  |
State and Local [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
State net operating losses | $ 20 |  | $ 20 |  |

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