Consolidating Guarantor Financial Information (Schedule of Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 287	$ 270
Investing Activities
Capital expenditures on property, plant and equipment	(70)	(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	0	(98)
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	(5)	(11)
Net cash provided by (used in) investing activities	(75)	(173)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	(344)	4
Proceeds from short-term borrowings	8	16
Repayments of short-term borrowings	(63)	(29)
Proceeds from long-term debt	170	0
Repayments of long-term debt	(177)	(6)
Purchases of treasury stock, including related fees	0	0
Dividends to parent	0	0
Contributions from parent	0	0
Stock option exercises	1	0
Series A common stock dividends	(44)	(38)
Return of capital to parent	0	0
Contributions from noncontrolling interests	0	80
Other, net	(24)	(10)
Net cash provided by (used in) financing activities	(473)	17
Exchange rate effects on cash and cash equivalents	10	(43)
Net increase (decrease) in cash and cash equivalents	(251)	71
Cash and cash equivalents as of beginning of period	967	780
Cash and cash equivalents as of end of period	716	851
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	44	38
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	0
Dividends to parent	0	0
Contributions from parent	0	0
Stock option exercises	1	0
Series A common stock dividends	(44)	(38)
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	(43)	(38)
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	1	0
Cash and cash equivalents as of beginning of period	0	0
Cash and cash equivalents as of end of period	1	0
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	47	18
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	136	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	138	1
Other, net	0	0
Net cash provided by (used in) investing activities	274	1
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	(353)	21
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	250	0
Repayments of long-term debt	(172)	(2)
Purchases of treasury stock, including related fees	0	0
Dividends to parent	(44)	(38)
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	(2)	0
Net cash provided by (used in) financing activities	(321)	(19)
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	(1)	79
Investing Activities
Capital expenditures on property, plant and equipment	(38)	(39)
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	(5)
Return of capital from subsidiary	734	0
Contributions to subsidiary	0	(16)
Intercompany loan receipts (disbursements)	3	(21)
Other, net	(3)	(9)
Net cash provided by (used in) investing activities	696	(90)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	6	5
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	325	0
Repayments of long-term debt	(634)	(1)
Purchases of treasury stock, including related fees	0	0
Dividends to parent	(68)	(38)
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	(9)
Net cash provided by (used in) financing activities	(371)	(43)
Exchange rate effects on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	324	(54)
Cash and cash equivalents as of beginning of period	21	110
Cash and cash equivalents as of end of period	345	56
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	309	211
Investing Activities
Capital expenditures on property, plant and equipment	(32)	(25)
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	(93)
Return of capital from subsidiary	0	0
Contributions to subsidiary	0	0
Intercompany loan receipts (disbursements)	90	0
Other, net	(2)	(2)
Net cash provided by (used in) investing activities	56	(120)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	0	(1)
Proceeds from short-term borrowings	8	16
Repayments of short-term borrowings	(63)	(29)
Proceeds from long-term debt	0	0
Repayments of long-term debt	(4)	(4)
Purchases of treasury stock, including related fees	0	0
Dividends to parent	0	0
Contributions from parent	0	16
Stock option exercises	0	0
Series A common stock dividends	0	0
Return of capital to parent	(870)	0
Contributions from noncontrolling interests	0	80
Other, net	(22)	(1)
Net cash provided by (used in) financing activities	(951)	77
Exchange rate effects on cash and cash equivalents	10	(43)
Net increase (decrease) in cash and cash equivalents	(576)	125
Cash and cash equivalents as of beginning of period	946	670
Cash and cash equivalents as of end of period	370	795
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(112)	(76)
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	(870)	0
Contributions to subsidiary	0	16
Intercompany loan receipts (disbursements)	(231)	20
Other, net	0	0
Net cash provided by (used in) investing activities	(1,101)	36
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	3	(21)
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings	0	0
Proceeds from long-term debt	(405)	0
Repayments of long-term debt	633	1
Purchases of treasury stock, including related fees	0	0
Dividends to parent	112	76
Contributions from parent	0	(16)
Stock option exercises	0	0
Series A common stock dividends	0	0
Return of capital to parent	870	0
Contributions from noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	1,213	40
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