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Income Taxes Level 4 AMT credit and foreign tax credit carryover (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 138 | $ 154
Deferred Tax Assets, Capital Loss Carryforwards | 21 | 78
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 639 | 639
No expiration tax year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | $ 639 |
Earliest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2020 |
Latest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2024 |
Expiring within Tax Years 2019 to 2024 [Member] [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 138 |
Expiring Tax Year 2019 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Capital Loss Carryforwards | 60 |
Before Tax [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Deferred Tax Asset | $ 138 | $ 154

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