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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Payroll Loans (Details) - USD ($) $ / shares in Units, shares in Millions	May 06, 2021	Jan. 15, 2021	Apr. 23, 2020	Sep. 29, 2020
Debt Instrument [Line Items]
CARES act, payroll support program, total payment			$ 963,000,000
CARES act, payroll support program, grant			$ 704,000,000
Debt instrument term			10 years
Class of warrant or right, outstanding (in shares)			2.7
Class of warrant or right, exercise price of warrants or rights (in dollars per share)			$ 9.50
Warrants and rights outstanding, term				5 years
Payroll Support 2 Payments
Debt Instrument [Line Items]
CARES act, payroll support program, grant		$ 436,000,000
Debt instrument term		10 years
Class of warrant or right, outstanding (in shares)		1.0
Class of warrant or right, exercise price of warrants or rights (in dollars per share)		$ 14.43
CARES Act, Payroll support program 2, total payment		$ 580,000,000
Payroll Support 3 Payments
Debt Instrument [Line Items]
CARES act, payroll support program, total payment	$ 541,000,000
CARES act, payroll support program, grant	$ 409,000,000
Debt instrument term	10 years
Class of warrant or right, outstanding (in shares)	0.7
Class of warrant or right, exercise price of warrants or rights (in dollars per share)	$ 19.90
US Department of Treasury \| Unsecured Debt
Debt Instrument [Line Items]
Principal amount			$ 259,000,000
Debt instrument, interest rate, stated percentage			1.00%
Debt instrument, basis spread on variable rate			2.00%
US Department of Treasury \| Unsecured Debt \| Payroll Support 2 Payments
Debt Instrument [Line Items]
Principal amount		$ 144,000,000
Debt instrument, interest rate, stated percentage		1.00%
Debt instrument, basis spread on variable rate		2.00%
US Department of Treasury \| Unsecured Debt \| Payroll Support 3 Payments
Debt Instrument [Line Items]
Principal amount	$ 132,000,000
Debt instrument, interest rate, stated percentage	1.00%
Debt instrument, basis spread on variable rate	2.00%