Pension and Postretirement Expense Level 4 (Details) - Components of net pension and postretirement expense benefit (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Pension Benefits - U.S. Plans [Member]
Pension Benefits and Non-Pension Postretirement Benefits Disclosures Table Text Block [Line Items]
Service cost	$ 1	$ 1
Interest cost on projected benefit obligation	3	3
Expected return on assets	(4)	(4)
Amortization of prior service cost (benefit)	0	2
Recognized actuarial loss	2	0
Net expense (benefit)	2	2
Pension Benefits - Non-U.S. Plans [Member]
Pension Benefits and Non-Pension Postretirement Benefits Disclosures Table Text Block [Line Items]
Service cost	4	2
Interest cost on projected benefit obligation	4	4
Expected return on assets	(2)	(3)
Amortization of prior service cost (benefit)	0	0
Recognized actuarial loss	2	0
Net expense (benefit)	8	3
Non-Pension Postretirement Benefits - U.S. Plans [Member]
Pension Benefits and Non-Pension Postretirement Benefits Disclosures Table Text Block [Line Items]
Service cost	0	0
Interest cost on projected benefit obligation	0	0
Expected return on assets	0	0
Amortization of prior service cost (benefit)	0	(2)
Recognized actuarial loss	0	0
Net expense (benefit)	0	(2)
Non-Pension Postretirement Benefits - Non-U.S. Plans [Member]
Pension Benefits and Non-Pension Postretirement Benefits Disclosures Table Text Block [Line Items]
Service cost	0	0
Interest cost on projected benefit obligation	0	0
Expected return on assets	0	0
Amortization of prior service cost (benefit)	0	0
Recognized actuarial loss	0	0
Net expense (benefit)	$ 0	$ 0