Consolidated Statements of Operations - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenues	$ 13,886,000,000	$ 13,806,000,000	$ 14,005,000,000
Costs and Expenses [Abstract]
Operating	8,324,000,000	8,089,000,000	8,124,000,000
Selling, general and administrative	2,455,000,000	2,462,000,000	2,546,000,000
Depreciation and amortization	264,000,000	281,000,000	290,000,000
Restructuring charges (Note 5)	81,000,000	26,000,000	20,000,000
Impairment charges (Note 3)	484,000,000	52,000,000	0
Gain on sales of businesses	(139,000,000)	0	0
Total costs and expenses	11,469,000,000	10,910,000,000	10,980,000,000
Operating income	2,417,000,000	2,896,000,000	3,025,000,000
Interest expense	(392,000,000)	(363,000,000)	(375,000,000)
Interest income	24,000,000	13,000,000	8,000,000
Loss on early extinguishment of debt (Note 9)	0	(352,000,000)	0
Other items, net	(26,000,000)	(30,000,000)	7,000,000
Earnings from continuing operations before income taxes and equity in loss of investee companies	2,023,000,000	2,164,000,000	2,665,000,000
Provision for income taxes	(587,000,000)	(762,000,000)	(878,000,000)
Equity in loss of investee companies, net of tax	(33,000,000)	(48,000,000)	(49,000,000)
Net earnings from continuing operations	1,403,000,000	1,354,000,000	1,738,000,000
Net earnings from discontinued operations, net of tax (Note 4)	10,000,000	1,605,000,000	141,000,000
Net earnings	$ 1,413,000,000	$ 2,959,000,000	$ 1,879,000,000
Basic net earnings per common share:
Basic net earnings from continuing operation (in dollars per share)	$ 2.90	$ 2.46	$ 2.86
Basic net earnings from discontinued operations (in dollars per share)	0.02	2.92	0.23
Basic net earnings (in dollars per share)	2.92	5.38	3.09
Diluted net earnings per common share:
Diluted net earnings from continuing operations (in dollars per share)	2.87	2.41	2.79
Diluted net earnings from discontinued operations (in dollars per share)	0.02	2.86	0.23
Diluted net earnings (in dollars per share)	$ 2.89	$ 5.27	$ 3.01
Weighted average number of shares outstanding [Abstract]
Basic weighted average number of common shares outstanding	484	550	608
Diluted weighted average number of common shares outstanding	489	561	624
Dividends per common share (in dollars per share)	$ 0.6	$ 0.54	$ 0.48