Accumulated Other Comprehensive Income (Loss) (AOCI) - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products	$ 517	$ 544	$ 959	$ 1,027
Cost of services	657	914	1,279	1,517
Selling, general and administrative expenses	229	339	453	564
Research and development expenses	50	67	103	122
Interest expense	43	45	89	89
Income (loss) income from continuing operations	74	(343)	106	(301)
Income tax expense	31	32	44	34
Total reclassifications	63	(344)	84	(304)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products		(2)		(4)
Cost of services	(2)	(2)	(5)	(4)
Selling, general and administrative expenses	(3)	(3)	(4)	(5)
Research and development expenses	(1)		(2)	(1)
Interest expense	1	1	2	2
Income (loss) income from continuing operations	(5)	(6)	(9)	(12)
Income tax expense	1	2	2	4
Total reclassifications	(4)	(4)	(7)	(8)
Reclassification out of Accumulated Other Comprehensive Income | Actuarial losses recognized
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products		0		0
Cost of services	0	0	0	1
Selling, general and administrative expenses	(1)	0	(1)	0
Research and development expenses	0		0	0
Interest expense	0	0	0	0
Income (loss) income from continuing operations	(1)	0	(1)	1
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service benefit
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products		0		0
Cost of services	(2)	(2)	(5)	(5)
Selling, general and administrative expenses	(2)	(3)	(3)	(5)
Research and development expenses	(1)		(2)	(1)
Interest expense	0	0	0	0
Income (loss) income from continuing operations	(5)	(5)	(10)	(11)
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedging [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products		(2)		(4)
Cost of services	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Research and development expenses	0		0	0
Interest expense	1	1	2	2
Income (loss) income from continuing operations	$ 1	$ (1)	$ 2	$ (2)