Restructuring Charges (Old Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Total, Beginning Balance	$ 50
Charge to Earnings	58
Cash Paid	(60)
Restructuring Reserve Settled without Cash Old Plan	(5)
Revision of Estimate	(4)
Transfer to New Plan	(39)
Total, Ending Balance	0
Termination costs [Member]
Restructuring Cost and Reserve [Line Items]
Total, Beginning Balance	36
Charge to Earnings	37
Cash Paid	(51)
Restructuring Reserve Settled without Cash Old Plan	0
Revision of Estimate	0
Transfer to New Plan	(22)
Total, Ending Balance	0
Non-employee exit costs [Member]
Restructuring Cost and Reserve [Line Items]
Total, Beginning Balance	14
Charge to Earnings	21
Cash Paid	(9)
Restructuring Reserve Settled without Cash Old Plan	(5)
Revision of Estimate	(4)
Transfer to New Plan	(17)
Total, Ending Balance	$ 0