Customer Financing (Schedule of Customer Financing Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Customer Financing [Line Items]
Gross customer financing	$ 2,054	$ 2,306
Operating lease equipment	715	834
B-717 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	637	736
Operating lease equipment	98	124
B-747-8 [Member]
Customer Financing [Line Items]
Gross customer financing	480	475
Operating lease equipment	121	130
B-737 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	235	263
Operating lease equipment	214	240
B-777 [Member]
Customer Financing [Line Items]
Gross customer financing	225	240
Operating lease equipment	216	236
MD-80 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	167	186
B-757 Aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	147	182
Operating lease equipment	4	22
B-747-400 aircraft [Member]
Customer Financing [Line Items]
Gross customer financing	71	90
Operating lease equipment	$ 19	$ 31