Other Liabilities (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Other current liabilities
Other taxes payable	$ 46	$ 41
Accounts payable	72	39
Accrued dividends payable	46	46
Accrued interest payable	37	21
Derivatives	7	6
Other payables	110	113
Total other current liabilities	318	266
Other non-current liabilities
Incentives from lessors	156	150
Deferred compensation plan liability	122	120
Capital lease obligation	25	23
Derivatives	7	6
Other payables	57	48
Total other non-current liabilities	367	347
Total other liabilities	$ 685	$ 613