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Income Taxes 2017 Tax Reform (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |
Federal income tax |  | 21.00% | 35.00% | 35.00%
New Federal Income Tax Rate | 21.00% |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ 0 | $ 1,240 | $ 0
Impact of the 2017 Tax Reform on Expense |  | 26 | 16 | $ 19
Impact of 2017 Tax Reform [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  | 1,240 |
Impact of the 2017 Tax Reform on Expense |  | 2 |  |
Impact of 2017 Tax Reform [Member] | after tax [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | 27 | 144 |
Impact of 2017 Tax Reform [Member] | pre-tax [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ 36 | $ 219 |

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