Supplemental Financial Information - Amounts Reclassified out of AOCI (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes		$ 350	$ 329	$ 927	$ 791
Net income		(798)	(826)	(2,150)	(1,996)
Interest and debt expense		22	23	68	72
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss)
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net actuarial gains (losses) of defined benefit plans	[1],[2]	19	25	59	58
Provision for income taxes		(6)	(8)	(19)	(20)
Net income		13	17	40	38
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) and Curtailment Gain
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes		0	0	(1)	0
Net income		0	(1)	1	0
Prior service cost of defined benefit plans:	[1],[2]	0	(1)	2	0
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes		0	0	0	0
Net income		1	0	1	1
Interest and debt expense		$ 1	$ 0	$ 1	$ 1

[1] Detailed in Note 8.

[2] Pension expense is included in COR, R&D, SG&A and Restructuring charges/other in the Consolidated Statements of Income