Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

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)	September 30, 2013			Level 1		Level 2			Level 3
Cash equivalents	$	2,702		$	2,702	$	—		$	—
Short-term investments	959			959		—			—
Restricted cash equivalents and investments	209			209		—			—
Long-term investments	112			84		28			—
Hedge derivatives, net
Fuel contracts	333			57		276			—
Interest rate contracts	(66		)	—		(66		)	—
Foreign currency exchange contracts	193			—		193			—

(in millions)	December 31, 2012			Level 1		Level 2			Level 3
Cash equivalents	$	2,176		$	2,176	$	—		$	—
Short-term investments	958			958		—			—
Restricted cash equivalents and investments	344			344		—			—
Long-term investments	208			100		27			81
Hedge derivatives, net
Fuel contracts	249			27		222			—
Interest rate contracts	(66		)	—		(66		)	—
Foreign currency exchange contracts	123			—		123			—