Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Customer Financing [Line Items]
Customer financing carrying value	$ 2,584	$ 2,887
Operating leases	879	782
B-717 [Member]
Customer Financing [Line Items]
Customer financing carrying value	882	918
Operating leases	201	204
B747-8 [Member]
Customer Financing [Line Items]
Customer financing carrying value	475	477
Operating leases	131	132
B-777 [Member]
Customer Financing [Line Items]
Customer financing carrying value	288	68
Operating leases	169	60
B-737 [Member]
Customer Financing [Line Items]
Customer financing carrying value	285	290
Operating leases	259	263
MD 80 Aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	207	204
B-757 [Member]
Customer Financing [Line Items]
Customer financing carrying value	195	200
Operating leases	24	24
B747-400 aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	111	116
Operating leases	$ 42	$ 45