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Income Taxes (Deferred Tax Assets for Loss and Tax Credit Carryforwards) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Net operating losses	$ 449
Tax credits	30
Deferred Tax Assets Loss And Tax Credit Carry Forward	479	$ 652
Tax Years 2018 Through 2022 [Member]
Net operating losses	121
Deferred Tax Assets Loss And Tax Credit Carry Forward	121
Tax Years 2023 Through 2027 [Member]
Net operating losses	60
Deferred Tax Assets Loss And Tax Credit Carry Forward	60
Tax Years 2028 Through 2037 [Member]
Net operating losses	25
Tax credits	25
Deferred Tax Assets Loss And Tax Credit Carry Forward	50
Indefinite [Member]
Net operating losses	243
Tax credits	5
Deferred Tax Assets Loss And Tax Credit Carry Forward	$ 248

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Deferred tax assets loss and tax credit carry forward

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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-Publisher FASB
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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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