Receivables (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Additional information on nonaccrual receivables
Interest income that would have been recorded if the nonaccrual receivables had been current in accordance with contractual terms during the period	$ 249	$ 246	$ 462	$ 436
Interest income that was recorded on nonaccrual receivables included in interest income on nonaccrual loans during the period	$ 61	$ 80	$ 80	$ 103