Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Assets (Liabilities) Measured at Fair Value on a Recurring Basis

Assets (Liabilities) Measured at Fair Value on a Recurring Basis

(in millions)	March 31, 2014			Level 1		Level 2
Cash equivalents	$	2,281		$	2,281	$	—
Short-term investments	959			959		—
Restricted cash equivalents and investments	104			104		—
Long-term investments	118			88		30
Hedge derivatives, net
Fuel hedge contracts	261			34		227
Interest rate contracts	(60		)	—		(60		)
Foreign currency exchange contracts	206			—		206

(in millions)	December 31, 2013			Level 1		Level 2
Cash equivalents	$	2,487		$	2,487	$	—
Short-term investments	959			959		—
Restricted cash equivalents and investments	118			118		—
Long-term investments	109			80		29
Hedge derivatives, net
Fuel hedge contracts	314			16		298
Interest rate contracts	(67		)	—		(67		)
Foreign currency exchange contracts	257			—		257