Condensed Consolidating Supplemental Guarantor Information - Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017
Cash and cash equivalents	$ 334		$ 537	$ 405
Accounts receivable, net	1,309		1,270
Inventories	916		780
Due from affiliates	0		0
Other current assets	296		243
Total current assets	2,855		2,830
Property, plant and equipment, net	348		341
Goodwill	2,589		2,741
Intangibles, net	501		578
Assets for Plan Benefits, Defined Benefit Plan	133		118
Deferred income taxes	488		460
Investments in subsidiaries	0		0
Due from affiliates	0		0
Other assets	591		586
Total assets	7,505		7,654
Short-term borrowings	246		52
Accounts payable	804		762
Payroll and benefits liabilities	225		219
Contract liabilities	427		458
Due to affiliates	0		0
Other current liabilities	302		398
Total current liabilities	2,004		1,889
Long-term debt	2,881		2,939
Pension and indemnity plan liabilities	803		798
Postretirement and postemployment benefits liabilities	130		133
Income tax accruals	118		148
Due to affiliates	0		0
Other liabilities	261		200
Total liabilities	6,197		6,107
Redeemable noncontrolling interest	14		15
Series A convertible preferred stock	846		810
Stockholders' Equity Attributable to Parent	444		719
Noncontrolling interests in subsidiaries	4		3
Total stockholders’ equity	448	$ 737	722
Total liabilities and stockholders’ equity	7,505		7,654
Eliminations
Cash and cash equivalents	0		0	0
Accounts receivable, net	0		0
Inventories	0		0
Due from affiliates	(3,102)		(2,730)
Other current assets	(39)		(36)
Total current assets	(3,141)		(2,766)
Property, plant and equipment, net	0		0
Goodwill	0		0
Intangibles, net	0		0
Assets for Plan Benefits, Defined Benefit Plan	0		0
Deferred income taxes	(10)		(31)
Investments in subsidiaries	(5,983)		(5,950)
Due from affiliates	(68)		(71)
Other assets	0		0
Total assets	(9,202)		(8,818)
Short-term borrowings	0		0
Accounts payable	0		0
Payroll and benefits liabilities	0		0
Contract liabilities	0		0
Due to affiliates	(3,102)		(2,730)
Other current liabilities	(39)		(36)
Total current liabilities	(3,141)		(2,766)
Long-term debt	0		0
Pension and indemnity plan liabilities	0		0
Postretirement and postemployment benefits liabilities	0		0
Income tax accruals	0		0
Due to affiliates	(68)		(71)
Other liabilities	(10)		(31)
Total liabilities	(3,219)		(2,868)
Redeemable noncontrolling interest	0		0
Series A convertible preferred stock	0		0
Stockholders' Equity Attributable to Parent	(5,983)		(5,950)
Noncontrolling interests in subsidiaries	0		0
Total stockholders’ equity	(5,983)		(5,950)
Total liabilities and stockholders’ equity	(9,202)		(8,818)
Parent Issuer
Cash and cash equivalents	31		97	35
Accounts receivable, net	39		62
Inventories	326		311
Due from affiliates	639		646
Other current assets	130		78
Total current assets	1,165		1,194
Property, plant and equipment, net	244		207
Goodwill	2,081		2,228
Intangibles, net	438		503
Assets for Plan Benefits, Defined Benefit Plan	0		0
Deferred income taxes	345		334
Investments in subsidiaries	3,177		3,008
Due from affiliates	31		31
Other assets	490		472
Total assets	7,971		7,977
Short-term borrowings	62		52
Accounts payable	357		382
Payroll and benefits liabilities	121		124
Contract liabilities	205		216
Due to affiliates	2,192		1,884
Other current liabilities	139		204
Total current liabilities	3,076		2,862
Long-term debt	2,879		2,937
Pension and indemnity plan liabilities	528		515
Postretirement and postemployment benefits liabilities	19		20
Income tax accruals	17		20
Due to affiliates	0		0
Other liabilities	162		94
Total liabilities	6,681		6,448
Redeemable noncontrolling interest	0		0
Series A convertible preferred stock	846		810
Stockholders' Equity Attributable to Parent	444		719
Noncontrolling interests in subsidiaries	0		0
Total stockholders’ equity	444		719
Total liabilities and stockholders’ equity	7,971		7,977
Guarantor Subsidiary
Cash and cash equivalents	5		11	10
Accounts receivable, net	12		12
Inventories	6		7
Due from affiliates	2,077		1,801
Other current assets	45		39
Total current assets	2,145		1,870
Property, plant and equipment, net	1		0
Goodwill	0		0
Intangibles, net	0		0
Assets for Plan Benefits, Defined Benefit Plan	0		0
Deferred income taxes	0		0
Investments in subsidiaries	2,806		2,942
Due from affiliates	1		1
Other assets	51		63
Total assets	5,004		4,876
Short-term borrowings	0		0
Accounts payable	3		0
Payroll and benefits liabilities	0		0
Contract liabilities	6		6
Due to affiliates	116		130
Other current liabilities	3		5
Total current liabilities	128		141
Long-term debt	0		0
Pension and indemnity plan liabilities	0		0
Postretirement and postemployment benefits liabilities	3		3
Income tax accruals	10		5
Due to affiliates	37		39
Other liabilities	16		36
Total liabilities	194		224
Redeemable noncontrolling interest	0		0
Series A convertible preferred stock	0		0
Stockholders' Equity Attributable to Parent	4,810		4,652
Noncontrolling interests in subsidiaries	0		0
Total stockholders’ equity	4,810		4,652
Total liabilities and stockholders’ equity	5,004		4,876
Non-Guarantor Subsidiaries
Cash and cash equivalents	298		429	$ 360
Accounts receivable, net	1,258		1,196
Inventories	584		462
Due from affiliates	386		283
Other current assets	160		162
Total current assets	2,686		2,532
Property, plant and equipment, net	103		134
Goodwill	508		513
Intangibles, net	63		75
Assets for Plan Benefits, Defined Benefit Plan	133		118
Deferred income taxes	153		157
Investments in subsidiaries	0		0
Due from affiliates	36		39
Other assets	50		51
Total assets	3,732		3,619
Short-term borrowings	184		0
Accounts payable	444		380
Payroll and benefits liabilities	104		95
Contract liabilities	216		236
Due to affiliates	794		716
Other current liabilities	199		225
Total current liabilities	1,941		1,652
Long-term debt	2		2
Pension and indemnity plan liabilities	275		283
Postretirement and postemployment benefits liabilities	108		110
Income tax accruals	91		123
Due to affiliates	31		32
Other liabilities	93		101
Total liabilities	2,541		2,303
Redeemable noncontrolling interest	14		15
Series A convertible preferred stock	0		0
Stockholders' Equity Attributable to Parent	1,173		1,298
Noncontrolling interests in subsidiaries	4		3
Total stockholders’ equity	1,177		1,301
Total liabilities and stockholders’ equity	$ 3,732		$ 3,619