Restructuring - Charges by Category (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges	$ (19)	$ 8,219	$ 0
Fleet Retirements
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges		4,409
Voluntary Programs and Other Employee Benefit Charges
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges		3,409
Receivables and Other
Restructuring Cost and Reserve [Line Items]
Total Restructuring Charges		$ 401