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Income Taxes Level 4 AMT credit and foreign tax credit carryover (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | $ 49 | $ 56
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | 650 | 640
Deferred Tax Assets, Tax Credit Carryforwards, General Business | 90 | 99
No expiration tax year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax | $ 650 |
Earliest Tax Year [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2021 |
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 | $ 49 |
Expiring Tax Year 2036 [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2036 |
Foreign Tax Authority [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Tax Credit Carryforward, Deferred Tax Asset | $ 49 | $ 56

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