Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Customer Financing [Line Items]
Customer financing carrying value	$ 3,962	$ 4,211
Operating leases	1,653	1,922
B-717 [Member]
Customer Financing [Line Items]
Customer financing carrying value	1,171	1,282
Operating leases	290	301
B747-8 [Member]
Customer Financing [Line Items]
Customer financing carrying value	1,058	1,111
Operating leases	938	1,086
B-757 [Member]
Customer Financing [Line Items]
Customer financing carrying value	238	246
Operating leases	41	43
MD 80 Aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	232	259
B-777 [Member]
Customer Financing [Line Items]
Customer financing carrying value	167	165
Operating leases	14
B747-400 aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	163	149
Operating leases	90	149
B-767 [Member]
Customer Financing [Line Items]
Customer financing carrying value	107	170
Operating leases	28	85
B-737 [Member]
Customer Financing [Line Items]
Customer financing carrying value	102	103
Operating leases	$ 97	$ 103