Pensions and Other Postretirement Benefits (Additional Information) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended			3 Months Ended		6 Months Ended			3 Months Ended	6 Months Ended
	Mar. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jan. 28, 2013	Jun. 30, 2013 Pension Plans, Defined Benefit [Member] Defined Contribution Pension [Member]	Jun. 30, 2012 Pension Plans, Defined Benefit [Member] Defined Contribution Pension [Member]	Jun. 30, 2013 Pension Plans, Defined Benefit [Member] Defined Contribution Pension [Member]	Jun. 30, 2012 Pension Plans, Defined Benefit [Member] Defined Contribution Pension [Member]	Jun. 30, 2013 Foreign Pension Plans, Defined Benefit [Member]	Mar. 31, 2013 Commodity Chemicals Segment [Member] Pension Plans, Defined Benefit [Member] Defined Contribution Pension [Member]	Jun. 30, 2013 Owen Sound Facility [Member]	Jun. 30, 2013 Pittsburgh Glass Works L L C [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected contributions to defined benefit pension plans in 2012									$ 77
Contributions to defined benefit pension plans									28
Settlement loss					0	0	(18)	0		(33)
Reduction in projected benefit obligation as a result of separation transaction				550
Reduction in accumulated benefit obligation as a result of separation transaction				165
Defined Benefit Plan, Assets Transferred to (from) Plan	480
Pension and Other Postretirement Benefit Expense		2	13
Pension Settlement Charge, Canadian wind-up		18									16	2
Defined Benefit Plan Settlements Benefit Obligation Low Estimate											15	40
Defined Benefit Plan Settlements Benefit Obligation High Estimate											20	50
Defined Benefit Plan Contributions By Employer Low Estimate											5	5
Defined Benefit Plan Contributions By Employer High Estimate											$ 10	$ 10