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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Debt - Debtor-in-Possession Credit Agreement (Details) - USD ($)	Mar. 31, 2021	Feb. 09, 2021	Dec. 31, 2020	Jun. 28, 2020
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 750,000,000
Outstanding borrowings	$ 1,262,000,000		$ 9,095,000,000
Debtor-in-Possession Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 2,104,000,000
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]
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 \| New Money Roll-Up Loans \| Term Loan
Debt Instrument [Line Items]
Debt				925,000,000
Debtor-in-Possession Credit Agreement \| Incremental Roll-Up Loans \| Term Loan
Debt Instrument [Line Items]
Debt				$ 254,000,000