Customer Financing (Schedule of Customer Financing Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Customer Financing [Line Items]
Gross customer financing	$ 2,887	$ 3,077
Operating lease equipment	782	691
B-717 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	918	1,081
Operating lease equipment	204	269
B-747-8 [Member]
Customer Financing [Line Items]
Gross customer financing	477	483
Operating lease equipment	132	138
B-737 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	290	161
Operating lease equipment	263	127
MD-80 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	204	231
B-757 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	200	217
Operating lease equipment	24	27
B-747-400 aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	116	170
Operating lease equipment	45	88
B-777 [Member]
Customer Financing [Line Items]
Gross customer financing	68	14
Operating lease equipment	$ 60
B-767 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing		98
Operating lease equipment		$ 25