Supplemental Guarantor Information (Details 1) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Current assets
Cash and cash equivalents	$ 326		$ 509	$ 338		$ 301
Accounts receivable, net of allowances
— third parties	1,518		1,382
— related parties	60		54
Inventories	1,504		1,173
Prepaid expenses and other current assets	124		101
Fair value of derivative instruments	79		51
Deferred income tax assets	76		101
Assets held for sale	73		102
Total current assets	3,760		3,473
Property, plant and equipment, net	3,535		3,513
Goodwill	608		611
Intangible assets, net	611		640
Investment in and advances to non–consolidated affiliates	560		612
Investments in consolidated subsidiaries	0		0
Deferred income tax assets	77		80
Other long-term assets
— third parties	160		173
— related parties	10		12
Total assets	9,321		9,114
Current liabilities
Current portion of long–term debt	92		92
Short-term borrowings
— third parties	1,044		723
— related parties	0		0
Accounts payable
— third parties	1,643		1,418
— related parties	53		53
Fair value of derivative instruments	96		60
— third parties	556		547
— related party	0		250
Deferred income tax liabilities	48		16
Liabilities held for sale	0		11
Total current liabilities	3,532		3,170
Long-term debt, net of current portion
— third parties	4,340		4,359
— related parties	0		0
Deferred income tax liabilities	344		425
Accrued postretirement benefits	612		621
Other long–term liabilities	256		271
Total liabilities	9,084		8,846
Commitments and contingencies
Total temporary equity - intercompany	0		0
Shareholder’s equity
Common stock	0		0
Additional paid–in capital	1,404		1,404
Retained earnings (accumulated deficit)	(1,000)		(1,073)
Accumulated other comprehensive income (loss)	(194)	(60)	(91)	(148)	(310)	(268)
Total equity of our common shareholder	210		240
Noncontrolling interests	27		28
Total equity	237		268
Total liabilities and equity	9,321		9,114
Parent [Member]
Current assets
Cash and cash equivalents	4		4	4		4
Accounts receivable, net of allowances
— third parties	20		15
— related parties	523		1,093
Inventories	36		36
Prepaid expenses and other current assets	5		5
Fair value of derivative instruments	10		12
Deferred income tax assets	0		0
Assets held for sale	0		28
Total current assets	598		1,193
Property, plant and equipment, net	98		100
Goodwill	0		0
Intangible assets, net	17		19
Investment in and advances to non–consolidated affiliates	0		0
Investments in consolidated subsidiaries	3,270		3,273
Deferred income tax assets	0		0
Other long-term assets
— third parties	64		73
— related parties	1,325		844
Total assets	5,372		5,502
Current liabilities
Current portion of long–term debt	21		21
Short-term borrowings
— third parties	566		367
— related parties	25		32
Accounts payable
— third parties	25		35
— related parties	69		89
Fair value of derivative instruments	34		14
— third parties	91		104
— related party	1		250
Deferred income tax liabilities	0		0
Liabilities held for sale			10
Total current liabilities	832		922
Long-term debt, net of current portion
— third parties	4,212		4,219
— related parties	49		49
Deferred income tax liabilities	0		0
Accrued postretirement benefits	42		44
Other long–term liabilities	27		28
Total liabilities	5,162		5,262
Total temporary equity - intercompany	0		0
Shareholder’s equity
Common stock	0		0
Additional paid–in capital	1,404		1,404
Retained earnings (accumulated deficit)	(1,000)		(1,073)
Accumulated other comprehensive income (loss)	(194)		(91)
Total equity of our common shareholder	210		240
Noncontrolling interests	0		0
Total equity	210		240
Total liabilities and equity	5,372		5,502
Guarantors [Member]
Current assets
Cash and cash equivalents	228		372	217		196
Accounts receivable, net of allowances
— third parties	1,243		1,121
— related parties	173		193
Inventories	1,117		880
Prepaid expenses and other current assets	92		76
Fair value of derivative instruments	50		26
Deferred income tax assets	71		96
Assets held for sale	73		74
Total current assets	3,047		2,838
Property, plant and equipment, net	2,507		2,485
Goodwill	597		600
Intangible assets, net	590		617
Investment in and advances to non–consolidated affiliates	560		612
Investments in consolidated subsidiaries	635		612
Deferred income tax assets	24		28
Other long-term assets
— third parties	87		89
— related parties	59		61
Total assets	8,106		7,942
Current liabilities
Current portion of long–term debt	9		10
Short-term borrowings
— third parties	412		287
— related parties	389		809
Accounts payable
— third parties	1,074		912
— related parties	245		377
Fair value of derivative instruments	54		40
— third parties	376		358
— related party	25		4
Deferred income tax liabilities	48		16
Liabilities held for sale			1
Total current liabilities	2,632		2,814
Long-term debt, net of current portion
— third parties	33		40
— related parties	1,266		788
Deferred income tax liabilities	338		419
Accrued postretirement benefits	408		422
Other long–term liabilities	220		236
Total liabilities	4,897		4,719
Total temporary equity - intercompany	1,681		1,681
Shareholder’s equity
Common stock	0		0
Additional paid–in capital	0		0
Retained earnings (accumulated deficit)	1,784		1,684
Accumulated other comprehensive income (loss)	(256)		(142)
Total equity of our common shareholder	1,528		1,542
Noncontrolling interests	0		0
Total equity	1,528		1,542
Total liabilities and equity	8,106		7,942
Non-Guarantor [Member]
Current assets
Cash and cash equivalents	94		133	117		101
Accounts receivable, net of allowances
— third parties	255		246
— related parties	101		57
Inventories	349		257
Prepaid expenses and other current assets	27		20
Fair value of derivative instruments	22		14
Deferred income tax assets	5		5
Assets held for sale	0		0
Total current assets	853		732
Property, plant and equipment, net	930		928
Goodwill	11		11
Intangible assets, net	4		4
Investment in and advances to non–consolidated affiliates	0		0
Investments in consolidated subsidiaries	0		0
Deferred income tax assets	53		52
Other long-term assets
— third parties	9		11
— related parties	0		0
Total assets	1,860		1,738
Current liabilities
Current portion of long–term debt	62		61
Short-term borrowings
— third parties	66		69
— related parties	0		0
Accounts payable
— third parties	544		471
— related parties	32		29
Fair value of derivative instruments	11		7
— third parties	89		85
— related party	4		2
Deferred income tax liabilities	0		0
Liabilities held for sale			0
Total current liabilities	808		724
Long-term debt, net of current portion
— third parties	95		100
— related parties	59		56
Deferred income tax liabilities	6		6
Accrued postretirement benefits	162		155
Other long–term liabilities	9		7
Total liabilities	1,139		1,048
Total temporary equity - intercompany	0		0
Shareholder’s equity
Common stock	0		0
Additional paid–in capital	0		0
Retained earnings (accumulated deficit)	701		680
Accumulated other comprehensive income (loss)	(7)		(18)
Total equity of our common shareholder	694		662
Noncontrolling interests	27		28
Total equity	721		690
Total liabilities and equity	1,860		1,738
Eliminations [Member]
Current assets
Cash and cash equivalents	0		0	0		0
Accounts receivable, net of allowances
— third parties	0		0
— related parties	(737)		(1,289)
Inventories	2		0
Prepaid expenses and other current assets	0		0
Fair value of derivative instruments	(3)		(1)
Deferred income tax assets	0		0
Assets held for sale	0		0
Total current assets	(738)		(1,290)
Property, plant and equipment, net	0		0
Goodwill	0		0
Intangible assets, net	0		0
Investment in and advances to non–consolidated affiliates	0		0
Investments in consolidated subsidiaries	(3,905)		(3,885)
Deferred income tax assets	0		0
Other long-term assets
— third parties	0		0
— related parties	(1,374)		(893)
Total assets	(6,017)		(6,068)
Current liabilities
Current portion of long–term debt	0		0
Short-term borrowings
— third parties	0		0
— related parties	(414)		(841)
Accounts payable
— third parties	0		0
— related parties	(293)		(442)
Fair value of derivative instruments	(3)		(1)
— third parties	0		0
— related party	(30)		(6)
Deferred income tax liabilities	0		0
Liabilities held for sale			0
Total current liabilities	(740)		(1,290)
Long-term debt, net of current portion
— third parties	0		0
— related parties	(1,374)		(893)
Deferred income tax liabilities	0		0
Accrued postretirement benefits	0		0
Other long–term liabilities	0		0
Total liabilities	(2,114)		(2,183)
Total temporary equity - intercompany	(1,681)		(1,681)
Shareholder’s equity
Common stock	0		0
Additional paid–in capital	0		0
Retained earnings (accumulated deficit)	(2,485)		(2,364)
Accumulated other comprehensive income (loss)	263		160
Total equity of our common shareholder	(2,222)		(2,204)
Noncontrolling interests	0		0
Total equity	(2,222)		(2,204)
Total liabilities and equity	$ (6,017)		$ (6,068)