Debt Instrument, Convertible, Discount On Conversion Price Rate

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Debt Instrument, Convertible, Internal Rate Of Return

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Debt Instrument, Convertible, Redemption Period

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Debt Instrument, Duration For Interest Type Payment Election

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Debt Instrument, Extension Period

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Debt Instrument, Increased Interest Rate For Final 2 Years Of Term

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Debt Instrument, Interest Rate During Maturity Extension Period

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Letters Of Credit Outstanding That Will Reduce The Available Credit Under Facilities

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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Long-Term Debt and Revolving Credit Arrangements - Narrative (Details) - USD ($)	1 Months Ended				3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2019	Oct. 31, 2018	Apr. 30, 2018	Jul. 31, 2016	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2015	Dec. 31, 2018	Jun. 13, 2018
Debt Instrument [Line Items]
Total debt	$ 5,797,000,000				$ 5,797,000,000			$ 5,797,000,000			$ 7,491,000,000
Embedded derivative liability (income) expense					$ 0	$ (117,000,000)	$ 89,000,000	$ (58,000,000)	$ 491,000,000
Secured Loans \| 2016 Senior Secured Term Loan
Debt Instrument [Line Items]
Proceeds from issuance of secured debt				$ 1,200,000,000
Debt discount				23,000,000
Debt issuance costs				$ 13,000,000
Effective Interest Rate	6.10%				6.10%			6.10%				6.10%
Total debt	$ 1,116,000,000				$ 1,116,000,000			$ 1,116,000,000			1,124,000,000
Secured Loans \| 2018 Senior Secured Term Loan
Debt Instrument [Line Items]
Proceeds from issuance of secured debt			$ 1,500,000,000
Debt discount			8,000,000
Debt issuance costs			$ 15,000,000
Effective Interest Rate	6.20%				6.20%			6.20%
Total debt	$ 1,481,000,000				$ 1,481,000,000			$ 1,481,000,000			1,493,000,000
Convertible Notes \| 2021 Convertible Notes
Debt Instrument [Line Items]
Debt discount										$ 1,100,000,000
Debt issuance costs										$ 1,000,000
Effective Interest Rate	23.50%				23.50%			23.50%		23.50%
Total debt	$ 0				$ 0			$ 0			1,844,000,000
Proceeds from issuance of convertible debt										$ 1,700,000,000
Stated interest rate										2.50%
Duration for interest type payment election										4 years
Interest rate increase during final 2 year initial term										12.50%
Embedded derivative liability (income) expense					$ 0		80,000,000	$ (20,000,000)	419,000,000
Convertible Notes \| 2021 Convertible Notes \| Minimum
Debt Instrument [Line Items]
Interest rate during maturity extension period										3.50%
Discount on conversion price rate										18.00%
Convertible Notes \| 2021 Convertible Notes \| Maximum
Debt Instrument [Line Items]
Interest rate during maturity extension period										12.50%
Discount on conversion price rate										30.50%
Convertible Notes \| 2022 Convertible Notes
Debt Instrument [Line Items]
Proceeds from issuance of secured debt										$ 949,000,000
Debt discount										312,000,000
Debt issuance costs										$ 100,000
Effective Interest Rate	13.70%				13.70%			13.70%
Total debt	$ 0				$ 0			$ 0			1,030,000,000
Extension period										1 year
Stated interest rate										2.50%
Convertible Notes, internal rate of return										8.00%
Redemption period										3 years
Embedded derivative liability (income) expense					$ 0		$ 9,000,000	$ (38,000,000)	$ 72,000,000
Convertible Notes \| 2022 Convertible Notes \| Minimum
Debt Instrument [Line Items]
Discount on conversion price rate										8.10%
Convertible Notes \| 2022 Convertible Notes \| Maximum
Debt Instrument [Line Items]
Discount on conversion price rate										44.50%
Senior Note
Debt Instrument [Line Items]
Aggregate principal amount		$ 2,000,000,000.0
Senior Note \| 2023 Senior Note
Debt Instrument [Line Items]
Debt issuance costs		$ 9,000,000
Effective Interest Rate	7.70%				7.70%			7.70%
Total debt	$ 500,000,000				$ 500,000,000			$ 500,000,000			500,000,000
Stated interest rate		7.50%
Debt instrument term		5 years
Aggregate principal amount		$ 500,000,000
Senior Note \| 2023 Senior Note \| Level 2
Debt Instrument [Line Items]
Debt instrument, fair value disclosure	$ 503,000,000				$ 503,000,000			$ 503,000,000
Senior Note \| 2026 Senior Note
Debt Instrument [Line Items]
Effective Interest Rate	8.10%				8.10%			8.10%
Total debt	$ 1,500,000,000				$ 1,500,000,000			$ 1,500,000,000			1,500,000,000
Stated interest rate		8.00%
Debt instrument term		8 years
Aggregate principal amount		$ 1,500,000,000
Senior Note \| 2026 Senior Note \| Level 2
Debt Instrument [Line Items]
Debt instrument, fair value disclosure	1,500,000,000				1,500,000,000			1,500,000,000
Senior Note \| 2027 Senior Note
Debt Instrument [Line Items]
Debt issuance costs	$ 11,000,000				$ 11,000,000			$ 11,000,000
Effective Interest Rate	7.70%				7.70%			7.70%
Total debt	$ 1,200,000,000				$ 1,200,000,000			$ 1,200,000,000			0
Stated interest rate	7.50%				7.50%			7.50%
Debt instrument term	8 years
Aggregate principal amount	$ 1,200,000,000				$ 1,200,000,000			$ 1,200,000,000
Senior Note \| 2027 Senior Note \| Level 2
Debt Instrument [Line Items]
Debt instrument, fair value disclosure	1,200,000,000				1,200,000,000			1,200,000,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Borrowing capacity	2,300,000,000				2,300,000,000			$ 2,300,000,000
Credit facility, term								5 years
Line of credit balance	0				0			$ 0
Line of Credit \| Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	561,000,000				561,000,000			561,000,000			470,000,000
Letters of credit outstanding that will reduce the available credit under facilities	$ 204,000,000				$ 204,000,000			$ 204,000,000			$ 166,000,000