Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Customer Financing [Line Items]
Customer financing carrying value	$ 2,005	$ 2,054
Operating leases	677	715
B-717
Customer Financing [Line Items]
Customer financing carrying value	617	637
Operating leases	73	98
B747-8
Customer Financing [Line Items]
Customer financing carrying value	479	480
Operating leases	120	121
B-737
Customer Financing [Line Items]
Customer financing carrying value	229	235
Operating leases	209	214
B-777
Customer Financing [Line Items]
Customer financing carrying value	223	225
Operating leases	216	216
MD 80 Aircraft
Customer Financing [Line Items]
Customer financing carrying value	170	167
B-757
Customer Financing [Line Items]
Customer financing carrying value	139	147
Operating leases	0	4
B747-400
Customer Financing [Line Items]
Customer financing carrying value	70	71
Operating leases	$ 19	$ 19