Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Customer Financing [Line Items]
Customer financing carrying value	$ 1,885	$ 2,054
Operating leases	505	715
B-717
Customer Financing [Line Items]
Customer financing carrying value	604	637
Operating leases	65	98
B747-8
Customer Financing [Line Items]
Customer financing carrying value	437	480
Operating leases	0	121
B-737
Customer Financing [Line Items]
Customer financing carrying value	185	235
Operating leases	166	214
B-777
Customer Financing [Line Items]
Customer financing carrying value	233	225
Operating leases	226	216
MD 80 Aircraft
Customer Financing [Line Items]
Customer financing carrying value	159	167
B-757
Customer Financing [Line Items]
Customer financing carrying value	130	147
Operating leases	0	4
B747-400
Customer Financing [Line Items]
Customer financing carrying value	61	71
Operating leases	$ 11	$ 19