Commitments, Contingencies And Guarantees (Narrative) (Details) (USD $)					3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Purchase [Member]	Mar. 31, 2013 Lease [Member]	Mar. 31, 2013 Capacity Purchase Arrangements [Member]
Long-term Purchase Commitment [Line Items]
Purchase deposits for flight equipment	$ 721,000,000	$ 710,000,000
Unrecorded Unconditional Purchase Obligation, Due Within One Year			1,600,000,000	624,000,000	257,000,000
Unrecorded Unconditional Purchase Obligation, Due Within Two Year			1,900,000,000	945,000,000	521,000,000
Unrecorded Unconditional Purchase Obligation, Due Within Three Year			1,700,000,000	1,200,000,000	670,000,000
Unrecorded Unconditional Purchase Obligation, Due Within Four Year			2,100,000,000	1,400,000,000	676,000,000
Unrecorded Unconditional Purchase Obligation, Due Within Five Year			2,100,000,000	1,600,000,000	520,000,000
Unrecorded Unconditional Purchase Obligation, Due After Five Year			12,600,000,000	11,700,000,000	4,400,000,000
Term of Unrecorded Unconditional Purchase Obligation					12
Maximum required to be paid by the company in one year under the guarantee	100,000,000
Maximum amount of guarantee provided	$ 85,000,000