FINANCING ACTIVITIES (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

(in millions)	December 31, 2021		December 31, 2020
2.75% Notes due 2022	$	300	$	300
Pass Through Certificates due 2022 - 6.24%	71		137
4.75% Notes due 2023	1,250		1,250
1.25% Convertible Notes due 2025	1,842		1,945
5.25% Notes due 2025	1,550		1,550
Term Loan Agreement payable through 2025	—		119
3.00% Notes due 2026	300		300
Term Loan Agreement payable through 2026	—		159
3.45% Notes due 2027	300		300
5.125% Notes due 2027	2,000		2,000
7.375% Debentures due 2027	116		119
Term Loan Agreement payable through 2028	—		184
2.625% Notes due 2030	500		500
1.000% Payroll Support Program Loan due April 2030 (See Note 2)	976		976
1.000% Payroll Support Program Loan due January 2031 (See Note 2)	566		—
1.000% Payroll Support Program Loan due April 2031 (See Note 2)	526		—
Finance leases	459		542
	$	10,756	$	10,381
Less current maturities	453		220
Less debt discount and issuance costs	29		50
	$	10,274	$	10,111

Convertible Debt

The following table details the equity and liability component recognized related to the Convertible Notes as of December 31, 2021 and 2020:

(in millions)	December 31, 2021		December 31, 2020
Carrying amount of equity component	$	311	$	403
Liability component:
Principal amount	$	2,097	$	2,300
Unamortized debt discount	(255)		(355)
Net carrying amount	$	1,842	$	1,945