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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Effective tax rate on income from continuing operations (as a percent) | 16.10% | 15.70% | 16.00% | 15.20% |
Valuation allowance | $ 21 |  | $ 21 |  | $ 20
Gross unrecognized tax benefits | 117 |  | 117 |  | 92
Unrecognized tax benefits net of federal tax benefits that would affect the effective tax rate | 81 |  | 81 |  | 70
Increase (decrease) in interest and penalties | 1 | $ 0 | 2 | $ 1 |
Payable related to accrued interest and penalties | 12 |  | 12 |  | $ 10
Minimum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Decrease in gross unrecognized tax benefits due to resolution of audits and statute expirations | 50 |  | 50 |  |
Maximum [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Decrease in gross unrecognized tax benefits due to resolution of audits and statute expirations | 60 |  | 60 |  |
State and Local [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
State net operating losses | $ 21 |  | $ 21 |  |

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