Accumulated Other Comprehensive Income (Loss) (AOCI) - Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products	$ 512	$ 547	$ 1,539	$ 1,554
Cost of services	644	696	2,161	1,969
Selling, general and administrative expenses	224	232	788	724
Research and development expenses	53	59	175	186
Interest expense	42	46	131	135
Income from continuing operations	(103)	0	198	(145)
Total reclassifications, net of tax	16	(19)	50	14
Net income	(98)	(15)	206	(158)
Other Nonoperating Income (Expense)	7	14	14	24
Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products	(4)		(8)
Cost of services	(3)	(2)	(7)	(7)
Selling, general and administrative expenses	1	(1)	(4)	(5)
Research and development expenses	(1)	(1)	(2)	(2)
Interest expense	2	1	4	4
Income from continuing operations	(5)	(3)	(17)	(10)
Total reclassifications, net of tax	2	1	6	4
Net income	(3)	(2)	(11)	(6)
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	1	1
Selling, general and administrative expenses	1	0	1	0
Research and development expenses	0	0	0	0
Interest expense	0	0	0	0
Income from continuing operations	1	0	2	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	(1)		(1)
Cost of services	(3)	(2)	(8)	(8)
Selling, general and administrative expenses	0	(1)	(5)	(5)
Research and development expenses	(1)	(1)	(2)	(2)
Interest expense	0	0	0	0
Income from continuing operations	(5)	(4)	(16)	(15)
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedging [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of products	(3)		(7)
Cost of services	0	0	0	0
Selling, general and administrative expenses	0	0	0	0
Research and development expenses	0	0	0	0
Interest expense	2	1	4	4
Income from continuing operations	$ (1)	$ 1	$ (3)	$ 4