Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Tax Contingency [Line Items]
Effective Income Tax Rate	24.60%	(17.10%)	22.10%	19.70%
Tax Benefit From Sale Of Non U S Leverage Lease		$ 34	$ 17	$ 34
Tax Accrued for Repatriation of Foreign Earnings Leveraged Lease Sale			15
Tax benefit related to foreign tax	36	18	58	27
Tax Accrual For Repatriation Of Foreign Earnings	$ 28		$ 28