Commitments and Contingencies Commitments and Contingencies (Schedule of 737 Max LIability) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies [Line Items]
737 MAX customer concessions and other considerations liability	$ 4,000
B-737
Commitments And Contingencies [Line Items]
737 MAX customer concessions and other considerations liability	3,964	$ 6,664	$ 5,537	$ 7,389
Payments made to customers	(1,538)	(1,211)
Concessions and other in-kind consideration to customers	(27)	(35)
Accrual for 737 MAX customer concessions and other considerations liability	$ (8)	$ 521