Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Customer Financing [Line Items]
Customer financing carrying value	$ 2,127	$ 2,306
Operating leases	764	834
B-717
Customer Financing [Line Items]
Customer financing carrying value	658	736
Operating leases	104	124
B747-8
Customer Financing [Line Items]
Customer financing carrying value	482	475
Operating leases	123	130
B-737
Customer Financing [Line Items]
Customer financing carrying value	242	263
Operating leases	220	240
B-777
Customer Financing [Line Items]
Customer financing carrying value	232	240
Operating leases	230	236
MD 80 Aircraft
Customer Financing [Line Items]
Customer financing carrying value	174	186
B-757
Customer Financing [Line Items]
Customer financing carrying value	162	182
Operating leases	14	22
B747-400
Customer Financing [Line Items]
Customer financing carrying value	80	90
Operating leases	$ 27	$ 31