Condensed Consolidating Supplemental Guarantor Information - Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Cash and cash equivalents	$ 401	$ 498	$ 333	$ 328
Accounts receivable, net	1,298	1,282
Inventories	800	699
Due from affiliates	0	0
Other current assets	281	278
Total current assets	2,780	2,757
Property, plant and equipment, net	288	287
Goodwill	2,732	2,727
Intangibles, net	645	672
Prepaid pension cost	100	94
Deferred income taxes	619	575
Investments in subsidiaries	0	0
Due from affiliates	0	0
Other assets	561	561
Total assets	7,725	7,673
Short-term borrowings	252	50
Accounts payable	765	781
Payroll and benefits liabilities	181	234
Deferred service revenue and customer deposits	562	468
Due to affiliates	0	0
Other current liabilities	399	432
Total current liabilities	2,159	1,965
Long-term debt	3,076	3,001
Pension and indemnity plan liabilities	749	739
Postretirement and postemployment benefits liabilities	128	127
Income tax accruals	145	142
Due to affiliates	0	0
Other liabilities	143	138
Total liabilities	6,400	6,112
Redeemable noncontrolling interest	14	15
Series A convertible preferred stock	776	847
Stockholders' Equity Attributable to Parent	530	695
Noncontrolling interests in subsidiaries	5	4
Total stockholders’ equity	535	699
Total liabilities and stockholders’ equity	7,725	7,673
Eliminations
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Inventories	0	0
Due from affiliates	(2,698)	(2,589)
Other current assets	(78)	(61)
Total current assets	(2,776)	(2,650)
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangibles, net	0	0
Prepaid pension cost	0	0
Deferred income taxes	(103)	(104)
Investments in subsidiaries	(6,201)	(6,097)
Due from affiliates	(1,056)	(1,088)
Other assets	0	0
Total assets	(10,136)	(9,939)
Short-term borrowings	0	0
Accounts payable	0	0
Payroll and benefits liabilities	0	0
Deferred service revenue and customer deposits	0	0
Due to affiliates	(2,698)	(2,589)
Other current liabilities	(78)	(61)
Total current liabilities	(2,776)	(2,650)
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	(1,056)	(1,088)
Other liabilities	(103)	(104)
Total liabilities	(3,935)	(3,842)
Redeemable noncontrolling interest	0	0
Series A convertible preferred stock	0	0
Stockholders' Equity Attributable to Parent	(6,201)	(6,097)
Noncontrolling interests in subsidiaries	0	0
Total stockholders’ equity	(6,201)	(6,097)
Total liabilities and stockholders’ equity	(10,136)	(9,939)
Parent Issuer
Cash and cash equivalents	26	65	16	15
Accounts receivable, net	76	64
Inventories	317	272
Due from affiliates	635	680
Other current assets	155	140
Total current assets	1,209	1,221
Property, plant and equipment, net	131	129
Goodwill	988	988
Intangibles, net	169	176
Prepaid pension cost	0	0
Deferred income taxes	540	499
Investments in subsidiaries	3,350	3,275
Due from affiliates	1,019	1,053
Other assets	411	405
Total assets	7,817	7,746
Short-term borrowings	46	46
Accounts payable	323	310
Payroll and benefits liabilities	93	129
Deferred service revenue and customer deposits	257	193
Due to affiliates	1,939	1,736
Other current liabilities	208	224
Total current liabilities	2,866	2,638
Long-term debt	3,073	2,998
Pension and indemnity plan liabilities	477	473
Postretirement and postemployment benefits liabilities	23	24
Income tax accruals	17	17
Due to affiliates	0	0
Other liabilities	55	54
Total liabilities	6,511	6,204
Redeemable noncontrolling interest	0	0
Series A convertible preferred stock	776	847
Stockholders' Equity Attributable to Parent	530	695
Noncontrolling interests in subsidiaries	0	0
Total stockholders’ equity	530	695
Total liabilities and stockholders’ equity	7,817	7,746
Guarantor Subsidiary
Cash and cash equivalents	13	12	22	20
Accounts receivable, net	22	25
Inventories	9	13
Due from affiliates	1,537	1,509
Other current assets	38	37
Total current assets	1,619	1,596
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangibles, net	0	0
Prepaid pension cost	0	0
Deferred income taxes	98	98
Investments in subsidiaries	2,851	2,822
Due from affiliates	1	0
Other assets	56	56
Total assets	4,625	4,572
Short-term borrowings	0	0
Accounts payable	3	2
Payroll and benefits liabilities	0	0
Deferred service revenue and customer deposits	4	5
Due to affiliates	148	154
Other current liabilities	4	6
Total current liabilities	159	167
Long-term debt	0	0
Pension and indemnity plan liabilities	0	0
Postretirement and postemployment benefits liabilities	3	3
Income tax accruals	4	4
Due to affiliates	36	35
Other liabilities	5	5
Total liabilities	207	214
Redeemable noncontrolling interest	0	0
Series A convertible preferred stock	0	0
Stockholders' Equity Attributable to Parent	4,418	4,358
Noncontrolling interests in subsidiaries	0	0
Total stockholders’ equity	4,418	4,358
Total liabilities and stockholders’ equity	4,625	4,572
Non-Guarantor Subsidiaries
Cash and cash equivalents	362	421	$ 295	$ 293
Accounts receivable, net	1,200	1,193
Inventories	474	414
Due from affiliates	526	400
Other current assets	166	162
Total current assets	2,728	2,590
Property, plant and equipment, net	157	158
Goodwill	1,744	1,739
Intangibles, net	476	496
Prepaid pension cost	100	94
Deferred income taxes	84	82
Investments in subsidiaries	0	0
Due from affiliates	36	35
Other assets	94	100
Total assets	5,419	5,294
Short-term borrowings	206	4
Accounts payable	439	469
Payroll and benefits liabilities	88	105
Deferred service revenue and customer deposits	301	270
Due to affiliates	611	699
Other current liabilities	265	263
Total current liabilities	1,910	1,810
Long-term debt	3	3
Pension and indemnity plan liabilities	272	266
Postretirement and postemployment benefits liabilities	102	100
Income tax accruals	124	121
Due to affiliates	1,020	1,053
Other liabilities	186	183
Total liabilities	3,617	3,536
Redeemable noncontrolling interest	14	15
Series A convertible preferred stock	0	0
Stockholders' Equity Attributable to Parent	1,783	1,739
Noncontrolling interests in subsidiaries	5	4
Total stockholders’ equity	1,788	1,743
Total liabilities and stockholders’ equity	$ 5,419	$ 5,294