Long Term Debt (Details 3) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 1,825
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	1,225
Pacific Routes Revolving Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	450
Bank Revolving Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 150