Long-Term Debt Long-Term Debt - Coverage Ratio Requirements (Details)	12 Months Ended
	Dec. 31, 2015 USD ($)
Pacific Facilities
Debt Instrument [Line Items]
Covenant terms, minimum fixed charge coverage ratio	1.20
Minimum collateral coverage ratio	1.60
Covenant terms, minimum unrestricted liquidity, unrestricted cash, permitted investments and undrawn revolving credit facilities	$ 2,000,000,000
2015 Credit Facilities
Debt Instrument [Line Items]
Covenant terms, minimum fixed charge coverage ratio	0
Minimum collateral coverage ratio	1.60
Covenant terms, minimum unrestricted liquidity, unrestricted cash, permitted investments and undrawn revolving credit facilities	$ 2,000,000,000
Line of credit | 2015 Credit Facilities
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 2,000,000,000
Collateral excluding non-Pacific international routes | 2015 Credit Facilities
Debt Instrument [Line Items]
Minimum collateral coverage ratio	0