Customer Financing (Schedule of Customer Financing Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Customer Financing [Line Items]
Gross customer financing	$ 3,061	$ 4,211
Operating lease equipment	1,020	1,922
B-717 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	1,081	1,282
Operating lease equipment	269	301
B-747-8 [Member]
Customer Financing [Line Items]
Gross customer financing	467	1,111
Operating lease equipment	467	1,086
MD-80 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	231	259
B-757 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	217	246
Operating lease equipment	27	43
B-747-400 aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	170	149
Operating lease equipment	88	149
B-737 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	161	103
Operating lease equipment	127	103
B-767 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	98	170
Operating lease equipment	25	85
B-777 [Member]
Customer Financing [Line Items]
Gross customer financing	$ 14	$ 165