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Debt and Other Obligations Debt and Other Obligations - Secured Notes of SPEs (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017	Sep. 20, 2017	Jan. 17, 2012	Nov. 14, 2001	Sep. 27, 2000
Secured notes
Secured notes	$ 40			$ 100
Interest rate				7.10%
Fair value of liabilities assumed	78		$ 74
Notes Payable	68	$ 121
Special purpose entity
Secured notes
Secured notes					$ 272	$ 255
Interest rate					5.572%	7.299%
7/20/16 Business Combination
Secured notes
Notes Payable	20	$ 48
9/20/17 Business Combination
Secured notes
Notes Payable	$ 48

X

- Definition

[Line Items] for Secured notes of SPEs [Table]

+ References

No definition available.

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- Definition

For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of acquisition related costs.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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- Definition

Face (par) amount of debt instrument at time of issuance.

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-Topic 835
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Publisher FASB
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- Definition

Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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