Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, pre-tax									$ (4)	$ 24	$ (149)
Income (loss) from discontinued operations, net of tax	4	0	(3)	2	6	4	9	(1)	3	18	(95)
Environmental matters [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, pre-tax									3	31	(143)
Income (loss) from discontinued operations, net of tax									2	20	(91)
Spin-off of Teradata [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, pre-tax									0	0	0
Income (loss) from discontinued operations, net of tax									6	3	0
Closure of the EFT Canadian Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, pre-tax									(2)	0	(1)
Income (loss) from discontinued operations, net of tax									(1)	0	(1)
Divestiture of the Healthcare Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, pre-tax									(5)	(7)	(5)
Income (loss) from discontinued operations, net of tax									$ (4)	$ (5)	$ (3)