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Income Taxes Deferred Tax Asset Expiration Periods (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Income Tax Examination [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	$ 178	$ 175
Expires from 2018 - 2037 [Member] | Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	3,400
Expires from 2018 - 2037 [Member] | State and Local Jurisdiction [Member] | Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	3,200
Expires from 2029 - 2036 [Member] | Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	134
Does Not Expire [Member]
Income Tax Examination [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	8
Expires 2018 - 2027 [Member]
Income Tax Examination [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	147
Majority expire from 2018 - 2023 [Member]
Income Tax Examination [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	$ 21

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