Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

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

(in millions)	September 30, 2012			Level 1		Level 2			Level 3
Cash equivalents	$	1,996		$	1,996	$	—		$	—
Short-term investments	959			959		—			—
Restricted cash equivalents and investments	400			400		—			—
Long-term investments	209			94		26			89
Hedge derivatives, net
Fuel hedge contracts	252			50		202			—
Interest rate contracts	(70		)	—		(70		)	—
Foreign currency exchange contracts	(33		)	—		(33		)	—

(in millions)	December 31, 2011			Level 1		Level 2			Level 3
Cash equivalents	$	2,357		$	2,357	$	—		$	—
Short-term investments	958			958		—			—
Restricted cash equivalents and investments	341			341		—			—
Long-term investments	188			55		24			109
Hedge derivatives, net
Fuel hedge contracts	70			—		70			—
Interest rate contracts	(91		)	—		(91		)	—
Foreign currency exchange contracts	(89		)	—		(89		)	—