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Income Taxes 2017 Tax Reform (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |
Federal income tax |  | 35.00% | 35.00% | 35.00%
New Federal Income Tax Rate | 21.00% |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ 1,240 | $ 0 | $ 0
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 2017 Tax Reform [Member] | Investee [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | 219 |  |
Impact of 2017 Tax Reform [Member] | after tax [Member] | Investee [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  | $ 144 |  |

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