Income Taxes (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Income Tax Disclosure [Abstract] | |||
| Federal statutory tax rate | 21.00% | 21.00% | 35.00% |
| Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset, Income Tax Expense | $ 5,400,000,000 | ||
| Deferred Tax Assets, Valuation Allowance | $ 37,000,000 | $ 46,000,000 | |
| Unrecognized Tax Benefits | $ 0 | ||