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Income Taxes - Deferred Tax Assets and Valuation Allowance, Taxes Receivable and Payable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Taxes receivable and payable
Valuation allowance - current period activities	$ 3,492	$ 106	$ (455)
NOLs untilized	593
Deferred tax liability		19
Deferred tax asset	3,269
Net deferred tax asset	3,500	3,800
Valuation allowance	242	$ 3,812
Current taxes payable	13
Current taxes receivable	1
Federal Tax Authority
Taxes receivable and payable
Operating loss carryforwards	2,100
State and Local Jurisdiction
Taxes receivable and payable
Operating loss carryforwards	360
Foreign Tax Authority
Taxes receivable and payable
Operating loss carryforwards	$ 105

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- Definition

Net Deferred Tax Asset, before valuation allowance

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Net Operating Loss Carryforwards Utilized

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

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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 the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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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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