Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Customer Financing [Line Items]
Customer financing carrying value	$ 1,955	$ 2,054
Operating leases	646	715
B-717
Customer Financing [Line Items]
Customer financing carrying value	611	637
Operating leases	69	98
B747-8
Customer Financing [Line Items]
Customer financing carrying value	478	480
Operating leases	119	121
B-737
Customer Financing [Line Items]
Customer financing carrying value	207	235
Operating leases	187	214
B-777
Customer Financing [Line Items]
Customer financing carrying value	228	225
Operating leases	221	216
MD 80 Aircraft
Customer Financing [Line Items]
Customer financing carrying value	156	167
B-757
Customer Financing [Line Items]
Customer financing carrying value	135	147
Operating leases	0	4
B747-400
Customer Financing [Line Items]
Customer financing carrying value	65	71
Operating leases	$ 11	$ 19