Consolidating Guarantor Financial Information (Schedule of Consolidating Statement of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 270	$ 164
Investing Activities
Capital expenditures on property, plant and equipment	(64)	(78)
Acquisitions, net of cash acquired	0	0
Proceeds from sale of businesses and assets, net	0	0
Capital expenditures related to Fairway Methanol LLC	(98)	(70)
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	(11)	(3)
Net cash provided by (used in) investing activities	(173)	(151)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	4	(3)
Proceeds from short-term borrowings	16	25
Repayments of short-term borrowings	(29)	(40)
Proceeds from long-term debt	0	0
Repayments of long-term debt	(6)	(6)
Purchases of treasury stock, including related fees	0	(53)
Dividends to parent	0	0
Contributions from parent	0	0
Stock option exercises	0	0
Series A common stock dividends	(38)	(28)
Return of capital to parent	0	0
Contributions from noncontrolling interests	80	109
Other, net	(10)	0
Net cash provided by (used in) financing activities	17	4
Exchange rate effects on cash and cash equivalents	(43)	(3)
Net increase (decrease) in cash and cash equivalents	71	14
Cash and cash equivalents as of beginning of period	780	984
Cash and cash equivalents as of end of period	851	998
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	38	81
Investing Activities
Capital expenditures on property, plant and equipment	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sale of businesses and assets, net	0	0
Capital expenditures related to Fairway Methanol LLC	0	0
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	0	0
Net cash provided by (used in) investing activities	0	0
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	0	0
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	0	0
Repayments of long-term debt	0	0
Purchases of treasury stock, including related fees	0	(53)
Dividends to parent	0	0
Contributions from parent	0	0
Stock option exercises	0	0
Series A common stock dividends	(38)	(28)
Return of capital to parent	0	0
Contributions from noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	(38)	(81)
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of beginning of period	0	0
Cash and cash equivalents as of end of period	0	0
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	18	60
Investing Activities
Capital expenditures on property, plant and equipment	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sale of businesses and assets, net	0	0
Capital expenditures related to Fairway Methanol LLC	0	0
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	1	1
Other, net	0	0
Net cash provided by (used in) investing activities	1	1
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	21	23
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	0	0
Repayments of long-term debt	(2)	(3)
Purchases of treasury stock, including related fees	0	0
Dividends to parent	(38)	(81)
Contributions from parent	0	0
Stock option exercises	0	0
Series A common stock dividends	0	0
Return of capital to parent	0	0
Contributions from noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	(19)	(61)
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of beginning of period	0	0
Cash and cash equivalents as of end of period	0	0
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	79	166
Investing Activities
Capital expenditures on property, plant and equipment	(39)	(64)
Acquisitions, net of cash acquired	0	0
Proceeds from sale of businesses and assets, net	0	0
Capital expenditures related to Fairway Methanol LLC	(5)	(26)
Return of capital from subsidiary	0	51
Contributions to subsidiary	(16)	(57)
Intercompany loan receipts (disbursements)	(21)	(23)
Other, net	(9)	(1)
Net cash provided by (used in) investing activities	(90)	(120)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	5	0
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	0	0
Repayments of long-term debt	(1)	(1)
Purchases of treasury stock, including related fees	0	0
Dividends to parent	(38)	(81)
Contributions from parent	0	0
Stock option exercises	0	0
Series A common stock dividends	0	0
Return of capital to parent	0	0
Contributions from noncontrolling interests		0
Other, net	(9)	0
Net cash provided by (used in) financing activities	(43)	(82)
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	(54)	(36)
Cash and cash equivalents as of beginning of period	110	284
Cash and cash equivalents as of end of period	56	248
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	211	19
Investing Activities
Capital expenditures on property, plant and equipment	(25)	(14)
Acquisitions, net of cash acquired	0	0
Proceeds from sale of businesses and assets, net	0	0
Capital expenditures related to Fairway Methanol LLC	(93)	(44)
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	(2)	(2)
Net cash provided by (used in) investing activities	(120)	(60)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	(1)	(3)
Proceeds from short-term borrowings	16	25
Repayments of short-term borrowings	(29)	(40)
Proceeds from long-term debt	0	0
Repayments of long-term debt	(4)	(3)
Purchases of treasury stock, including related fees	0	0
Dividends to parent	0	0
Contributions from parent	16	57
Stock option exercises	0	0
Series A common stock dividends	0	0
Return of capital to parent	0	(51)
Contributions from noncontrolling interests	80	109
Other, net	(1)	0
Net cash provided by (used in) financing activities	77	94
Exchange rate effects on cash and cash equivalents	(43)	(3)
Net increase (decrease) in cash and cash equivalents	125	50
Cash and cash equivalents as of beginning of period	670	700
Cash and cash equivalents as of end of period	795	750
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(76)	(162)
Investing Activities
Capital expenditures on property, plant and equipment	0	0
Acquisitions, net of cash acquired	0	0
Proceeds from sale of businesses and assets, net	0	0
Capital expenditures related to Fairway Methanol LLC	0	0
Return of capital from subsidiary	0	(51)
Contributions to subsidiary	16	57
Intercompany loan receipts (disbursements)	20	22
Other, net	0	0
Net cash provided by (used in) investing activities	36	28
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	(21)	(23)
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	0	0
Repayments of long-term debt	1	1
Purchases of treasury stock, including related fees	0	0
Dividends to parent	76	162
Contributions from parent	(16)	(57)
Stock option exercises	0	0
Series A common stock dividends	0	0
Return of capital to parent	0	51
Contributions from noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	40	134
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents as of beginning of period	0	0
Cash and cash equivalents as of end of period	$ 0	$ 0