Separation and Merger Transaction (Details) (USD $)	3 Months Ended			6 Months Ended	9 Months Ended		24 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Jan. 28, 2015	Jan. 31, 2013	Jan. 28, 2013	Dec. 31, 2012
Separation And Merger Transaction [Line Items]
Reconciling amount between segment assets and assets of the disposal group										$ 50,000,000
Disposal Group, Including Discontinued Operation, Inventory										76,000,000
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents										29,000,000
Reconciling amount between Segment Income and Disposal Group income before income taxes		10,000,000				17,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax	0
Common stock available for distribution in exchange									35,249,104
Proceed from separation of business				1,730,000,000
Final exchange ratio									3.2562
Treasury Stock, Shares, Acquired	10,825,227
Percent Reduction in number of Common Shares Outstanding								7.00%
Increase in treasury stock as a result of tender offer, noncash financing activity		1,562,000,000			(1,561,000,000)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		2,200,000,000
Contract Term							P24M
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	6,000,000		54,000,000		2,197,000,000	189,000,000
Net Income (Loss) Attributable to Noncontrolling Interest	29,000,000		25,000,000		94,000,000	97,000,000
Income from discontinued operations, net of tax (Note 5)	6,000,000		51,000,000		2,197,000,000	179,000,000
Disposal Group, Including Discontinued Operation, Other Current Assets										23,000,000
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net										380,000,000
Disposal Group, Including Discontinued Operation, Goodwill										6,000,000
Disposal Group, Including Discontinued Operation, Other Noncurrent Assets										29,000,000
Assets of Disposal Group, Including Discontinued Operation										788,000,000
Disposal Group, Including Discontinued Operation, Accounts Payable										100,000,000
Disposal Group, Including Discontinued Operation, Other Current Liabilities										(91,000,000)
Disposal Group, Including Discontinued Operation, Pension Plan Benefit Obligation										(233,000,000)
Disposal group, including discontinued operations, environmental contingencies									(31,000,000)	(31,000,000)
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent										(59,000,000)
Disposal group, including discontinued operations, noncontrolling interest										(18,000,000)
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net										245,000,000
Disposal group, including discontinued operations, Net Assets attributable to parent										256,000,000
Commodity Chemicals Segment [Member]
Separation And Merger Transaction [Line Items]
Proceed from separation of business		900,000,000
Cash Divested from Deconsolidation		27,000,000
Value of Shares to be received in new company after separation of business									1,800,000,000
Transaction expenses related to separation and merger transaction		14,000,000
Discontinued operations, Net costs incurred in separation transaction		2,000,000
working capital adjustment [Domain] | Commodity Chemicals Segment [Member]
Separation And Merger Transaction [Line Items]
Proceed from separation of business		67,000,000
Commodity Chemicals Segment [Member]
Separation And Merger Transaction [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	0		437,000,000		108,000,000	1,283,000,000
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax			84,000,000		0	283,000,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	0		0		2,192,000,000	0
Discontinued Operation, Tax Effect of Discontinued Operation	6,000,000		(30,000,000)		5,000,000	(94,000,000)
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	6,000,000		54,000,000		2,197,000,000	189,000,000
Net Income (Loss) Attributable to Noncontrolling Interest			3,000,000		0	10,000,000
Income from discontinued operations, net of tax (Note 5)	6,000,000		51,000,000		2,197,000,000	179,000,000
Defined Contribution Pension [Member] | Pension Plans, Defined Benefit [Member]
Separation And Merger Transaction [Line Items]
Settlement loss	0		0		(18,000,000)	0
Defined Contribution Pension [Member] | Pension Plans, Defined Benefit [Member] | Commodity Chemicals Segment [Member]
Separation And Merger Transaction [Line Items]
Settlement loss		$ (33,000,000)