Commitments, Contingencies And Guarantees (Aircraft Acquisition Commitments) (Details)	Sep. 30, 2013 aircraft
Operating Leased Assets [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	6
Aircraft lease commitment, future minimum quantity required, current (commitment)	10
Aircraft purchase committment, future minimum quantity required, year two (commitment)	28
Aircraft lease commitment, future minimum quantity required, year two (commitment)	35
Aircraft purchase committment, future minimum quantity required, year three (commitment)	13
Aircraft lease commitment, future minimum quantity required, year three (commitment)	50
Aircraft purchase committment, future minimum quantity required, year four (commitment)	15
Aircraft lease commitment, future minimum quantity required, year four (commitment)	45
Aircraft purchase committment, future minimum quantity required, year five (commitment)	22
Aircraft lease commitment, future minimum quantity required, year five (commitment)	40
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	224
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	308
Total, Lease	180
Boeing 737 Family [Member]
Operating Leased Assets [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	5
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	20
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	0
Aircraft lease commitment, future minimum quantity required, year three (commitment)	20
Aircraft purchase committment, future minimum quantity required, year four (commitment)	0
Aircraft lease commitment, future minimum quantity required, year four (commitment)	20
Aircraft purchase committment, future minimum quantity required, year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, year five (commitment)	20
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	25
Total, Lease	60
Boeing 737 Max Aircraft [Member]
Operating Leased Assets [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	0
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	0
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	0
Aircraft lease commitment, future minimum quantity required, year three (commitment)	0
Aircraft purchase committment, future minimum quantity required, year four (commitment)	0
Aircraft lease commitment, future minimum quantity required, year four (commitment)	0
Aircraft purchase committment, future minimum quantity required, year five (commitment)	3
Aircraft lease commitment, future minimum quantity required, year five (commitment)	0
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	97
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	100
Total, Lease	0
Boeing 777-300ER Aircraft [Member]
Operating Leased Assets [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	1
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	6
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	2
Aircraft lease commitment, future minimum quantity required, year three (commitment)	0
Aircraft purchase committment, future minimum quantity required, year four (commitment)	2
Aircraft lease commitment, future minimum quantity required, year four (commitment)	0
Aircraft purchase committment, future minimum quantity required, year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, year five (commitment)	0
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	11
Total, Lease	0
Boeing 787 Family [Member]
Operating Leased Assets [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	0
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	2
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	11
Aircraft lease commitment, future minimum quantity required, year three (commitment)	0
Aircraft purchase committment, future minimum quantity required, year four (commitment)	13
Aircraft lease commitment, future minimum quantity required, year four (commitment)	0
Aircraft purchase committment, future minimum quantity required, year five (commitment)	9
Aircraft lease commitment, future minimum quantity required, year five (commitment)	0
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	7
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	42
Total, Lease	0
Airbus A320 Family [Member]
Operating Leased Assets [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	0
Aircraft lease commitment, future minimum quantity required, current (commitment)	10
Aircraft purchase committment, future minimum quantity required, year two (commitment)	0
Aircraft lease commitment, future minimum quantity required, year two (commitment)	35
Aircraft purchase committment, future minimum quantity required, year three (commitment)	0
Aircraft lease commitment, future minimum quantity required, year three (commitment)	30
Aircraft purchase committment, future minimum quantity required, year four (commitment)	0
Aircraft lease commitment, future minimum quantity required, year four (commitment)	25
Aircraft purchase committment, future minimum quantity required, year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, year five (commitment)	20
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	0
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	0
Total, Lease	120
A320 Neo Airbus Aircraft [Member]
Operating Leased Assets [Line Items]
Aircraft purchase committment, future minimum quantity required, current (commitment)	0
Aircraft lease commitment, future minimum quantity required, current (commitment)	0
Aircraft purchase committment, future minimum quantity required, year two (commitment)	0
Aircraft lease commitment, future minimum quantity required, year two (commitment)	0
Aircraft purchase committment, future minimum quantity required, year three (commitment)	0
Aircraft lease commitment, future minimum quantity required, year three (commitment)	0
Aircraft purchase committment, future minimum quantity required, year four (commitment)	0
Aircraft lease commitment, future minimum quantity required, year four (commitment)	0
Aircraft purchase committment, future minimum quantity required, year five (commitment)	10
Aircraft lease commitment, future minimum quantity required, year five (commitment)	0
Aircraft purchase committment, future minimum quantity required, after year five (commitment)	120
Aircraft lease commitment, future minimum quantity required, after year five (commitment)	0
Total, Purchase	130
Total, Lease	0