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Income Taxes - Narrative (Details) - USD ($) $ in Billions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Oct. 04, 2016
Income Taxes |  |
Operating loss carryforwards expected to expire | $ 1.6 |
Minimum |  |
Income Taxes |  |
Number of tax years open for state tax audit (in years) | 3 years |
Maximum |  |
Income Taxes |  |
Number of tax years open for state tax audit (in years) | 5 years |
Earliest Tax Year |  |
Income Taxes |  |
Open tax year | 2005 |
Latest Tax Year |  |
Income Taxes |  |
Open tax year | 2014 |
Domestic Tax Authority |  |
Income Taxes |  |
Operating loss carryforwards subject to limitation |  | $ 1.9
Domestic Tax Authority | Earliest Tax Year |  |
Income Taxes |  |
Open tax year | 2015 |

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