Organization and Basis of Presentation (Details) $ in Millions	1 Months Ended	6 Months Ended
Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) segment
Income Taxes [Line Items]
Number of reportable segments \| segment		1
Interest payment received from the IRS	$ 37
Out of Period Adjustment [Member]
Income Taxes [Line Items]
Current tax asset, out of period adjustment	36	$ 36
Deferred tax asset, out of period adjustment	$ (36)	$ (36)

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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, netted by jurisdiction and classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 4
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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting and classified as noncurrent.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

Interest received on loans and other debt instruments during the current period.

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