Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Customer Financing [Line Items]
Customer financing carrying value	$ 2,251	$ 2,887
Operating leases	789	782
B-717 [Member]
Customer Financing [Line Items]
Customer financing carrying value	778	918
Operating leases	184	204
B747-8 [Member]
Customer Financing [Line Items]
Customer financing carrying value	474	477
Operating leases	130	132
B-737 [Member]
Customer Financing [Line Items]
Customer financing carrying value	266	290
Operating leases	243	263
B-757 [Member]
Customer Financing [Line Items]
Customer financing carrying value	186	200
Operating leases	22	24
MD 80 Aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	184	204
B-777 [Member]
Customer Financing [Line Items]
Customer financing carrying value	131	68
Operating leases	126	60
B747-400 aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	95	116
Operating leases	$ 33	$ 45