Consolidated Statements of Operations (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Operations [Abstract]
Revenues	$ 3,418,000,000	$ 3,365,000,000	$ 10,818,000,000	$ 10,461,000,000
Expenses:
Operating	1,841,000,000	1,810,000,000	6,179,000,000	6,116,000,000
Selling, general and administrative	679,000,000	718,000,000	2,056,000,000	2,059,000,000
Impairment charges (Note 3)	0	0	11,000,000	0
Depreciation and amortization	127,000,000	134,000,000	390,000,000	412,000,000
Total expenses	2,647,000,000	2,662,000,000	8,636,000,000	8,587,000,000
Operating Income (Loss)	771,000,000	703,000,000	2,182,000,000	1,874,000,000
Interest expense	(95,000,000)	(110,000,000)	(309,000,000)	(330,000,000)
Interest income	2,000,000	2,000,000	5,000,000	5,000,000
Net loss on early extinguishment of debt (Note 6)	(57,000,000)	0	(32,000,000)	0
Other items, net	3,000,000	(21,000,000)	12,000,000	(7,000,000)
Earnings (loss) before income taxes and equity in earnings (loss) of investee companies	624,000,000	574,000,000	1,858,000,000	1,542,000,000
(Provision) benefit for income taxes	(219,000,000)	(217,000,000)	(647,000,000)	(569,000,000)
Equity in loss of investee companies, net of tax	(14,000,000)	(19,000,000)	(30,000,000)	(38,000,000)
Net earnings	$ 391,000,000	$ 338,000,000	$ 1,181,000,000	$ 935,000,000
Basic net earnings per common share (in dollars per share)	$ 0.61	$ 0.51	$ 1.83	$ 1.40
Diluted net earnings per common share (in dollars per share)	$ 0.60	$ 0.50	$ 1.78	$ 1.36
Weighted average number of common shares outstanding:
Basic weighted average number of common shares outstanding	640	659	645	667
Diluted weighted average number of common shares outstanding	656	675	662	685
Dividends per common share (in dollars per share)	$ 0.12	$ 0.10	$ 0.32	$ 0.25