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Debt - Narrative (Details)		3 Months Ended	9 Months Ended
	Jun. 28, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Write-off of debt issuance costs and debt discounts or premiums		$ 457,000,000	$ 480,000,000
Outstanding borrowings		$ 9,095,000,000	$ 9,095,000,000	$ 9,458,000,000
FLLO Term Loan Facility | Term Loan
Debt Instrument [Line Items]
Applicable margin		7.00%
Applicable margin increase		0.0200
FLLO Term Loan Facility | Term Loan | Alternative Base Rate (ABR)
Debt Instrument [Line Items]
Variable rate percentage		3.25%
FLLO Term Loan Facility | Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate percentage		8.00%
Debtor-in-Possession Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,104,000,000
Commitment fee percentage	0.50%
Debtor-in-Possession Credit Agreement | Minimum
Debt Instrument [Line Items]
Asset coverage ratio	1.25
Debtor-in-Possession Credit Agreement | Alternative Base Rate (ABR)
Debt Instrument [Line Items]
Variable rate percentage	5.00%
Debtor-in-Possession Credit Agreement | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate percentage	6.00%
Debtor-in-Possession Credit Agreement | Term Loan
Debt Instrument [Line Items]
Debt	$ 1,179,000,000
Debtor-in-Possession Credit Agreement | Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	925,000,000
Letters of credit outstanding, amount	200,000,000
Debtor-in-Possession Credit Agreement | Revolving credit facility | Line of credit
Debt Instrument [Line Items]
Outstanding borrowings	$ 750,000,000
Debtor-in-Possession Credit Agreement | Revolving credit facility | Line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate percentage	3.50%
Debtor-in-Possession Credit Agreement | New Money Roll-Up Loans | Term Loan
Debt Instrument [Line Items]
Debt	$ 925,000,000
Debtor-in-Possession Credit Agreement | New Money Roll-Up Loans | Term Loan | Alternative Base Rate (ABR)
Debt Instrument [Line Items]
Variable rate percentage	4.50%
Debtor-in-Possession Credit Agreement | New Money Roll-Up Loans | Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate percentage	5.50%
Debtor-in-Possession Credit Agreement | Incremental Roll-Up Loans | Term Loan
Debt Instrument [Line Items]
Debt	$ 254,000,000
Debtor-in-Possession Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Commitment fee percentage	0.125%

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-SubTopic 210
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 470
-SubTopic 20
-Section 50
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