v2.4.0.6

Earnings (Loss) Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Earnings (loss) from continuing operations	$ 521	$ 1,040	$ 184	$ 389	$ 478	$ 429	$ 352	$ 1,074	$ 2,134	$ 2,333	$ (2,753)
Basic earnings (loss) from continuing operations per share	$ 1.29	$ 2.51	$ 0.44	$ 0.91	$ 1.10	$ 0.99	$ 0.79	$ 2.40	$ 5.12	$ 5.31	$ (6.20)
Diluted earnings from continuing operations per share	$ 1.29	$ 2.50	$ 0.43	$ 0.91	$ 1.10	$ 0.98	$ 0.79	$ 2.39	$ 5.10	$ 5.29	$ (6.20)
Antidilutive securities excluded from computation of earnings per share, amount									3	6	9
Earnings [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Earnings (loss) from continuing operations									2,134	2,333	(2,753)
Attributable to participating securities									(23)	(26)	31
Net earnings (loss) applicable to common stockholders									2,111	2,307
Diluted earnings per share									2,111	2,307
Basic and diluted loss per share											$ (2,722)
Common Shares [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Earnings from continuing operations, in shares									417	440	444
Attributable to participating securities, in shares									(5)	(5)	(5)
Basic earnings per share, shares									412	435
Dilutive effect of potential common shares issuable upon the exercise of outstanding stock options, in shares									2	1
Diluted earnings per share, shares									414	436
Basic and diluted earnings per share, shares											439
Earnings (Loss) Per Share [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Basic earnings (loss) from continuing operations per share									$ 5.12	$ 5.31
Diluted earnings from continuing operations per share									$ 5.10	$ 5.29
Basic and diluted loss from continuing operations per share											$ (6.20)

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