Consolidated Statements of Operations (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statements of Operations [Abstract]
Revenues	$ 3,924,000,000	$ 3,510,000,000
Expenses:
Operating	2,461,000,000	2,276,000,000
Selling, general and administrative	679,000,000	658,000,000
Impairment charges	11,000,000	0
Depreciation and amortization	131,000,000	139,000,000
Total expenses	3,282,000,000	3,073,000,000
Operating income	642,000,000	437,000,000
Interest expense	(110,000,000)	(110,000,000)
Interest income	2,000,000	2,000,000
Gain on early extinguishment of debt	25,000,000	0
Other items, net	12,000,000	9,000,000
Earnings (loss) before income taxes and equity in earnings (loss) of investee companies	571,000,000	338,000,000
(Provision) benefit for income taxes	(203,000,000)	(122,000,000)
Equity in loss of investee companies, net of tax	(5,000,000)	(14,000,000)
Net earnings	$ 363,000,000	$ 202,000,000
Basic net earnings per common share (in dollars per share)	$ 0.56	$ 0.30
Diluted net earnings per common share (in dollars per share)	$ 0.54	$ 0.29
Weighted average number of common shares outstanding:
Basic weighted average number of common shares outstanding	650	674
Diluted weighted average number of common shares outstanding	667	693
Dividends per common share (in dollars per share)	$ 0.10	$ 0.05