Interest Income and Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Interest Expense And Income Disclosure [Abstract]
Interest Expense, Debt	$ 109	[1]	$ 124	[1]	$ 218	[1]	$ 251	[1]
Interest Income	$ 147	[2]	$ 168	[2]	$ 298	[2]	$ 337	[2]

[1] Includes Equipment financing interest, as well as non-financing interest expense that is included in Other expenses, net in the Condensed Consolidated Statements of Income.

[2] Includes Finance income, as well as other interest income that is included in Other expenses, net in the Condensed Consolidated Statements of Income.