Customer Financing (Carrying Values Related to Major Aircraft Concentrations) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Customer Financing [Line Items]
Customer financing carrying value	$ 3,504	$ 3,582
Operating leases	1,649	1,677
B-717 [Member]
Customer Financing [Line Items]
Customer financing carrying value	1,532	1,562
Operating leases	416	421
747 Aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	580	601
Operating leases	580	601
MD 80 Aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	361	358
Operating leases
B-757 [Member]
Customer Financing [Line Items]
Customer financing carrying value	347	370
Operating leases	343	349
B-767 [Member]
Customer Financing [Line Items]
Customer financing carrying value	169	158
Operating leases	61	47
B-737 [Member]
Customer Financing [Line Items]
Customer financing carrying value	151	156
Operating leases	124	127
MD-11 Aircraft [Member]
Customer Financing [Line Items]
Customer financing carrying value	108	114
Operating leases	$ 108	$ 114