Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Customer Financing [Line Items]
Document Period End Date	Jun. 30, 2019
Customer financing carrying value	$ 2,318	$ 2,887
Operating leases	831	782
B-717 [Member]
Customer Financing [Line Items]
Customer financing carrying value	806	918
Operating leases	194	204
B747-8 [Member]
Customer Financing [Line Items]
Customer financing carrying value	474	477
Operating leases	129	132
B-737 [Member]
Customer Financing [Line Items]
Customer financing carrying value	279	290
Operating leases	256	263
B-757 [Member]
Customer Financing [Line Items]
Customer financing carrying value	191	200
Operating leases	23	24
MD 80 Aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	181	204
B-777 [Member]
Customer Financing [Line Items]
Customer financing carrying value	149	68
Operating leases	142	60
B747-400 aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	99	116
Operating leases	$ 34	$ 45