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Commitments, Contingencies And Guarantees (Aircraft Acquisition Commitments) (Details)
Jan. 23, 2013
Dec. 31, 2012
Property Subject to or Available for Operating Lease [Line Items]    
Current, Purchase 39 39
Current, Lease 20 20
Year Two, Purchase 13 11
Year Two, Lease 50 50
Year Three, Purchase 13 2
Year Three, Lease 50 50
Year Four, Purchase 15 2
Year Four, Lease 45 45
Year Five, Purchase 19 10
Year Five, Lease 40 40
Year Six and beyond, Purchase 227 120
Year Six and beyond, Lease 0 0
Total, Purchase 326 184
Total, Lease 205 205
Boeing 737 Family [Member]
   
Property Subject to or Available for Operating Lease [Line Items]    
Current, Purchase 31 31
Current, Lease 0 0
Year Two, Purchase 5 5
Year Two, Lease 15 15
Year Three, Purchase 0   
Year Three, Lease 20 20
Year Four, Purchase 0 0
Year Four, Lease 20 20
Year Five, Purchase 0 0
Year Five, Lease 20 20
Year Six and beyond, Purchase 0 0
Year Six and beyond, Lease 0 0
Total, Purchase 36 36
Total, Lease 75 75
Boeing 777-200 ER Aircraft [Member]
   
Property Subject to or Available for Operating Lease [Line Items]    
Current, Purchase   0
Current, Lease   0
Year Two, Purchase   1
Year Two, Lease   0
Year Three, Purchase   2
Year Three, Lease   0
Year Four, Purchase   2
Year Four, Lease   0
Year Five, Purchase   0
Year Five, Lease   0
Year Six and beyond, Purchase   0
Year Six and beyond, Lease   0
Total, Purchase   5
Total, Lease   0
Boeing 777-300 ER Aircraft [Member]
   
Property Subject to or Available for Operating Lease [Line Items]    
Current, Purchase 8 8
Current, Lease 0 0
Year Two, Purchase 6 5
Year Two, Lease 0 0
Year Three, Purchase 2 0
Year Three, Lease 0 0
Year Four, Purchase 2 0
Year Four, Lease 0 0
Year Five, Purchase 0 0
Year Five, Lease 0 0
Year Six and beyond, Purchase 0 0
Year Six and beyond, Lease 0 0
Total, Purchase 18 13
Total, Lease 0 0
Airbus A320 Family [Member]
   
Property Subject to or Available for Operating Lease [Line Items]    
Current, Purchase 0 0
Current, Lease 20 20
Year Two, Purchase 0 0
Year Two, Lease 35 35
Year Three, Purchase 0 0
Year Three, Lease 30 30
Year Four, Purchase 0 0
Year Four, Lease 25 25
Year Five, Purchase 0 0
Year Five, Lease 20 20
Year Six and beyond, Purchase 0 0
Year Six and beyond, Lease 0 0
Total, Purchase 0 0
Total, Lease 130 130
NEO [Member]
   
Property Subject to or Available for Operating Lease [Line Items]    
Current, Purchase   0
Current, Lease   0
Year Two, Purchase   0
Year Two, Lease   0
Year Three, Purchase   0
Year Three, Lease   0
Year Four, Purchase   0
Year Four, Lease   0
Year Five, Purchase   10
Year Five, Lease   0
Year Six and beyond, Purchase   120
Year Six and beyond, Lease   0
Total, Purchase   130
Total, Lease   0