Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Customer Financing [Line Items]
Customer financing carrying value	$ 3,489	$ 4,211
Operating leases	1,327	1,922
B-717 [Member]
Customer Financing [Line Items]
Customer financing carrying value	1,114	1,282
Operating leases	274	301
B747-8 [Member]
Customer Financing [Line Items]
Customer financing carrying value	769	1,111
Operating leases	769	1,086
MD 80 Aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	236	259
B-757 [Member]
Customer Financing [Line Items]
Customer financing carrying value	233	246
Operating leases	39	43
B747-400 aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	178	149
Operating leases	94	149
B-777 [Member]
Customer Financing [Line Items]
Customer financing carrying value	166	165
Operating leases	13
B-767 [Member]
Customer Financing [Line Items]
Customer financing carrying value	103	170
Operating leases	27	85
B-737 [Member]
Customer Financing [Line Items]
Customer financing carrying value	99	103
Operating leases	$ 94	$ 103