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Income Taxes Deferred Tax Assets and Valuation Allowances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 7
Deferred Tax Assets, Operating Loss Carryforwards	1,249	$ 935
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	260	178
Deferred Tax Assets, Valuation Allowance	178	171
Tax Adjustments, Settlements, and Unusual Provisions	(8)
Deferred Tax Assets, Capital Loss Carryforwards	17
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Increase (Decrease)		(137)
Proceeds from Income Tax Refunds	145
Capital Loss Carryforward [Member]
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	17
Foreign Currency Gain (Loss) [Member]
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(6)
SEC Schedule, 12-09, Valuation Allowance, Tax Credit Carryforward [Member]
Valuation Allowance [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(4)
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Valuation Allowance [Line Items]
Deferred Tax Assets, Valuation Allowance	$ 140	$ 133

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