Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Customer Financing [Line Items]
Customer financing carrying value	$ 3,007	$ 3,077
Operating leases	808	691
B-717 [Member]
Customer Financing [Line Items]
Customer financing carrying value	1,039	1,081
Operating leases	256	269
B747-8 [Member]
Customer Financing [Line Items]
Customer financing carrying value	481	483
Operating leases	136	138
B-737 [Member]
Customer Financing [Line Items]
Customer financing carrying value	289	161
Operating leases	257	127
MD 80 Aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	235	231
B-757 [Member]
Customer Financing [Line Items]
Customer financing carrying value	213	217
Operating leases	26	27
B747-400 aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	162	170
Operating leases	83	88
B-767 [Member]
Customer Financing [Line Items]
Customer financing carrying value	16	98
Operating leases		25
B-777 [Member]
Customer Financing [Line Items]
Customer financing carrying value	30	14
Operating leases	$ 17