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Income Taxes - Deferred Tax Assets and Valuation Allowance, Taxes Receivable and Payable (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Taxes receivable and payable
Net deferred tax asset	$ 3,800	$ 2,000
Valuation allowance	3,812	1,855
Deferred tax liability	19
Net deferred tax asset		113
Foreign net operating loss carryforwards	62	66
Foreign capital loss carryforwards	1	$ 1
Current taxes payable	3
Current taxes receivable	1
Federal Tax Authority
Taxes receivable and payable
Valuation allowance	3,300
Operating loss carryforwards	2,200
State and Local Jurisdiction
Taxes receivable and payable
Valuation allowance	454
Operating loss carryforwards	379
Foreign Tax Authority
Taxes receivable and payable
Deferred tax liability	16
Operating loss carryforwards	$ 62

X

- Definition

The tax effect as of the balance sheet date of the amount of future tax deductions arising from foreign capital losses in excess of statutory limitations in historical filings, and which can only be utilized if sufficient tax-basis income is generated in future periods and tax laws are provided to continue to allow such utilization.

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Net Deferred Tax Asset, before valuation allowance

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.

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Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S. Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes. Also called income tax refund receivable.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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