Consolidating Guarantor Financial Information (Schedule of Consolidating Cash Flow Statements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 893	$ 862	$ 962
Investing Activities
Capital expenditures on property, plant and equipment	(246)	(232)	(254)
Acquisitions, net of cash acquired	(178)	(6)	(10)
Proceeds from sale of businesses and assets, net	12	4	0
Capital expenditures related to Fairway Methanol LLC	0	(288)	(424)
Return of capital from subsidiary	0	0	0
Contributions to subsidiary	0	0	0
Intercompany loan receipts (disbursements)	0	0	0
Other, net	(27)	(36)	(17)
Net cash provided by (used in) investing activities	(439)	(558)	(705)
Financing Activities
Short-term borrowings (repayments), net	(352)	350	(9)
Proceeds from short-term borrowings	53	80	62
Repayments of short-term borrowings	(90)	(83)	(91)
Proceeds from long-term debt	1,509	0	387
Repayments of long-term debt	(1,127)	(24)	(626)
Purchases of treasury stock, including related fees	(500)	(420)	(250)
Dividends to parent	0	0	0
Contributions from parent	0	0	0
Stock option exercises	6	3	5
Series A common stock dividends	(201)	(174)	(144)
Return of capital to parent	0	0	0
(Distributions to) contributions from noncontrolling interests	(24)	214	264
Other, net	(33)	(12)	(13)
Net cash provided by (used in) financing activities	(759)	(66)	(415)
Exchange rate effects on cash and cash equivalents	(24)	(51)	(46)
Net increase (decrease) in cash and cash equivalents	(329)	187	(204)
Cash and cash equivalents as of beginning of period	967	780	984
Cash and cash equivalents as of end of period	638	967	780
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	695	591	389
Investing Activities
Capital expenditures on property, plant and equipment	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sale of businesses and assets, net	0	0	0
Capital expenditures related to Fairway Methanol LLC	0	0	0
Return of capital from subsidiary	0	0	0
Contributions to subsidiary	0	0	0
Intercompany loan receipts (disbursements)	0	0	0
Other, net	0	0	0
Net cash provided by (used in) investing activities	0	0	0
Financing Activities
Short-term borrowings (repayments), net	0	0	0
Proceeds from short-term borrowings	0	0	0
Repayments of short-term borrowings	0	0	0
Proceeds from long-term debt	0	0	0
Repayments of long-term debt	0	0	0
Purchases of treasury stock, including related fees	(500)	(420)	(250)
Dividends to parent	0	0	0
Contributions from parent	0	0	0
Stock option exercises	6	3	5
Series A common stock dividends	(201)	(174)	(144)
Return of capital to parent	0	0	0
(Distributions to) contributions from noncontrolling interests	0	0	0
Other, net	0	0	0
Net cash provided by (used in) financing activities	(695)	(591)	(389)
Exchange rate effects on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents as of beginning of period	0	0	0
Cash and cash equivalents as of end of period	0	0	0
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	711	536	498
Investing Activities
Capital expenditures on property, plant and equipment	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sale of businesses and assets, net	0	0	0
Capital expenditures related to Fairway Methanol LLC	0	0	0
Return of capital from subsidiary	145	0	28
Contributions to subsidiary	0	0	0
Intercompany loan receipts (disbursements)	(283)	(333)	(70)
Other, net	0	0	0
Net cash provided by (used in) investing activities	(138)	(333)	(42)
Financing Activities
Short-term borrowings (repayments), net	(371)	383	93
Proceeds from short-term borrowings	0	0	0
Repayments of short-term borrowings	0	0	0
Proceeds from long-term debt	1,589	15	462
Repayments of long-term debt	(1,083)	(9)	(611)
Purchases of treasury stock, including related fees	0	0	0
Dividends to parent	(695)	(592)	(390)
Contributions from parent	0	0	0
Stock option exercises	0	0	0
Series A common stock dividends	0	0	0
Return of capital to parent	0	0	0
(Distributions to) contributions from noncontrolling interests	0	0	0
Other, net	(13)	0	(10)
Net cash provided by (used in) financing activities	(573)	(203)	(456)
Exchange rate effects on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents as of beginning of period	0	0	0
Cash and cash equivalents as of end of period	0	0	0
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(21)	529	644
Investing Activities
Capital expenditures on property, plant and equipment	(139)	(128)	(183)
Acquisitions, net of cash acquired	0	(3)	(10)
Proceeds from sale of businesses and assets, net	1	0	0
Capital expenditures related to Fairway Methanol LLC	0	(20)	(44)
Return of capital from subsidiary	758	0	51
Contributions to subsidiary	0	(120)	(213)
Intercompany loan receipts (disbursements)	19	(33)	(93)
Other, net	(10)	(12)	(9)
Net cash provided by (used in) investing activities	629	(316)	(501)
Financing Activities
Short-term borrowings (repayments), net	1	0	6
Proceeds from short-term borrowings	0	0	0
Repayments of short-term borrowings	0	0	0
Proceeds from long-term debt	746	406	75
Repayments of long-term debt	(635)	(74)	(5)
Purchases of treasury stock, including related fees	0	0	0
Dividends to parent	(669)	(624)	(390)
Contributions from parent	0	0	0
Stock option exercises	0	0	0
Series A common stock dividends	0	0	0
Return of capital to parent	0	0	0
(Distributions to) contributions from noncontrolling interests	0	0	0
Other, net	(21)	(10)	(3)
Net cash provided by (used in) financing activities	(578)	(302)	(317)
Exchange rate effects on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	30	(89)	(174)
Cash and cash equivalents as of beginning of period	21	110	284
Cash and cash equivalents as of end of period	51	21	110
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	872	422	433
Investing Activities
Capital expenditures on property, plant and equipment	(107)	(104)	(71)
Acquisitions, net of cash acquired	(178)	(3)	0
Proceeds from sale of businesses and assets, net	11	4	0
Capital expenditures related to Fairway Methanol LLC	0	(268)	(380)
Return of capital from subsidiary	0	0	0
Contributions to subsidiary	0	0	0
Intercompany loan receipts (disbursements)	90	(15)	(75)
Other, net	(17)	(24)	(8)
Net cash provided by (used in) investing activities	(201)	(410)	(534)
Financing Activities
Short-term borrowings (repayments), net	(1)	0	(15)
Proceeds from short-term borrowings	53	80	62
Repayments of short-term borrowings	(90)	(83)	(91)
Proceeds from long-term debt	0	0	0
Repayments of long-term debt	(42)	(14)	(15)
Purchases of treasury stock, including related fees	0	0	0
Dividends to parent	0	0	(222)
Contributions from parent	0	120	213
Stock option exercises	0	0	0
Series A common stock dividends	0	0	0
Return of capital to parent	(903)	0	(79)
(Distributions to) contributions from noncontrolling interests	(24)	214	264
Other, net	1	(2)	0
Net cash provided by (used in) financing activities	(1,006)	315	117
Exchange rate effects on cash and cash equivalents	(24)	(51)	(46)
Net increase (decrease) in cash and cash equivalents	(359)	276	(30)
Cash and cash equivalents as of beginning of period	946	670	700
Cash and cash equivalents as of end of period	587	946	670
Consolidation Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(1,364)	(1,216)	(1,002)
Investing Activities
Capital expenditures on property, plant and equipment	0	0	0
Acquisitions, net of cash acquired	0	0	0
Proceeds from sale of businesses and assets, net	0	0	0
Capital expenditures related to Fairway Methanol LLC	0	0	0
Return of capital from subsidiary	(903)	0	(79)
Contributions to subsidiary	0	120	213
Intercompany loan receipts (disbursements)	174	381	238
Other, net	0	0	0
Net cash provided by (used in) investing activities	(729)	501	372
Financing Activities
Short-term borrowings (repayments), net	19	(33)	(93)
Proceeds from short-term borrowings	0	0	0
Repayments of short-term borrowings	0	0	0
Proceeds from long-term debt	(826)	(421)	(150)
Repayments of long-term debt	633	73	5
Purchases of treasury stock, including related fees	0	0	0
Dividends to parent	1,364	1,216	1,002
Contributions from parent	0	(120)	(213)
Stock option exercises	0	0	0
Series A common stock dividends	0	0	0
Return of capital to parent	903	0	79
(Distributions to) contributions from noncontrolling interests	0	0	0
Other, net	0	0	0
Net cash provided by (used in) financing activities	2,093	715	630
Exchange rate effects on cash and cash equivalents	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents as of beginning of period	0	0	0
Cash and cash equivalents as of end of period	$ 0	$ 0	$ 0