Risk Management and Financial Instruments (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion Recognized in Other Comprehensive Income (Loss)	$ (198)	$ (323)	$ (33)	$ (273)
Effective Portion Reclassified from Accumulated Other Comprehensive Loss to Earnings	63	(18)	112	(35)
Ineffective Portion Reclassified in Other (Expense) Income	0	(46)	(10)	(37)
Fuel Hedge Swaps Collars and Call Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion Recognized in Other Comprehensive Income (Loss)	(154)	(285)	(66)	(226)
Effective Portion Reclassified from Accumulated Other Comprehensive Loss to Earnings	74	(14)	134	(26)
Ineffective Portion Reclassified in Other (Expense) Income	0	(46)	(10)	(37)
Interest Rate Swaps And Call Options Designated As Cash Flow Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion Recognized in Other Comprehensive Income (Loss)	(11)	(28)	7	(39)
Effective Portion Reclassified from Accumulated Other Comprehensive Loss to Earnings	0	0	0	0
Ineffective Portion Reclassified in Other (Expense) Income	0	0	0	0
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective Portion Recognized in Other Comprehensive Income (Loss)	(33)	(10)	26	(8)
Effective Portion Reclassified from Accumulated Other Comprehensive Loss to Earnings	(11)	(4)	(22)	(9)
Ineffective Portion Reclassified in Other (Expense) Income	$ 0	$ 0	$ 0	$ 0