Commitments, Contingencies And Guarantees (Narrative) (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Long-term Purchase Commitment [Line Items]
Purchase deposits for flight equipment	$ 696,000,000	$ 710,000,000
Purchase [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded unconditional purchase obligation, due within one year	800,000,000
Unrecorded unconditional purchase obligation, due within year two	2,000,000,000
Unrecorded unconditional purchase obligation, due within year three	1,700,000,000
Unrecorded unconditional purchase obligation, due within year four	2,000,000,000
Unrecorded unconditional purchase obligation, due within year five	2,100,000,000
Unrecorded unconditional purchase obligation, due after five years	12,200,000,000
Lease [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded unconditional purchase obligation, due within one year	427,000,000
Unrecorded unconditional purchase obligation, due within year two	979,000,000
Unrecorded unconditional purchase obligation, due within year three	1,200,000,000
Unrecorded unconditional purchase obligation, due within year four	1,400,000,000
Unrecorded unconditional purchase obligation, due within year five	1,600,000,000
Unrecorded unconditional purchase obligation, due after five years	12,200,000,000
Capacity Purchase Arrangements [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded unconditional purchase obligation, due within one year	200,000,000
Unrecorded unconditional purchase obligation, due within year two	522,000,000
Unrecorded unconditional purchase obligation, due within year three	671,000,000
Unrecorded unconditional purchase obligation, due within year four	671,000,000
Unrecorded unconditional purchase obligation, due within year five	515,000,000
Unrecorded unconditional purchase obligation, due after five years	$ 4,300,000,000