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Income Taxes (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	$ 113	$ 164
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	$ 530	$ 530

X

- Definition

Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves, classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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- Definition

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 state and local income tax expense (benefit).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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