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Income Taxes Deferred Tax Asset Expiration Periods (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Tax Examination [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	$ 260	$ 178
Deferred Tax Assets, Capital Loss Carryforwards	17
Foreign Tax Authority [Member]
Income Tax Examination [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	112
Tax Credit Carryforwards	17
State and Local Jurisdiction [Member] | Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards	3,700
Indefinite Tax Period [Member] | Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards	1,400
Expires from 2019 - 2037 [Member] | Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards	3,400
General Business Tax Credit Carryforward [Member]
Income Tax Examination [Line Items]
Tax Credit Carryforwards	241
Capital Loss Carryforward [Member]
Income Tax Examination [Line Items]
Operating Loss Carryforwards	$ 17

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