Consolidated Statements of Operations (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Operations [Abstract]
Revenues	$ 3,476,000,000	$ 3,586,000,000	$ 7,400,000,000	$ 7,096,000,000
Expenses:
Operating	1,877,000,000	2,030,000,000	4,338,000,000	4,306,000,000
Selling, general and administrative	698,000,000	683,000,000	1,377,000,000	1,341,000,000
Impairment charges (Note 3)	0	0	11,000,000	0
Depreciation and amortization	132,000,000	139,000,000	263,000,000	278,000,000
Total expenses	2,707,000,000	2,852,000,000	5,989,000,000	5,925,000,000
Operating income	769,000,000	734,000,000	1,411,000,000	1,171,000,000
Interest expense	(104,000,000)	(110,000,000)	(214,000,000)	(220,000,000)
Interest income	1,000,000	1,000,000	3,000,000	3,000,000
Gain on early extinguishment of debt (Note 6)	0	0	25,000,000	0
Other items, net	(3,000,000)	5,000,000	9,000,000	14,000,000
Earnings (loss) before income taxes and equity in earnings (loss) of investee companies	663,000,000	630,000,000	1,234,000,000	968,000,000
(Provision) benefit for income taxes	(225,000,000)	(230,000,000)	(428,000,000)	(352,000,000)
Equity in loss of investee companies, net of tax	(11,000,000)	(5,000,000)	(16,000,000)	(19,000,000)
Net earnings	$ 427,000,000	$ 395,000,000	$ 790,000,000	$ 597,000,000
Basic net earnings per common share (in dollars per share)	$ 0.66	$ 0.59	$ 1.22	$ 0.89
Diluted net earnings per common share (in dollars per share)	$ 0.65	$ 0.58	$ 1.19	$ 0.87
Weighted average number of common shares outstanding:
Basic weighted average number of common shares outstanding	646	669	648	671
Diluted weighted average number of common shares outstanding	661	686	664	689
Dividends per common share (in dollars per share)	$ 0.10	$ 0.10	$ 0.20	$ 0.15