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Income Taxes Level 4 Net Operating Loss Carryover (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 5,924 | $ 5,547
Deferred Tax Assets, Operating Loss Carryforwards | 2,065 | 1,936
Tax Credit Carryforward, Valuation Allowance | $ 12 | 0
Earliest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2016 |
Expiring within Tax Years 2016 to 2017 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 3 |
Latest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2033 |
Expiring within Tax Years 2023 to 2033 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 5,863 |
No expiration tax year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 58 |
Non-US [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 56 | 39
Before Tax [Member] | UNITED STATES |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | $ 5,868 | $ 5,508

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