Per Share Data (Diluted EPS Calculation Continuing Operations) (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Net income (loss) from continuing operations	$ 286	$ (29)	$ 605	$ 245
Less: Net income attributable to non-controlling interests	7	6	13	10
Basic weighted average common shares outstanding	547	541	545	537
Diluted weighted average common shares outstanding	555	545	554	541
Continuing Operations [Member]
Net income (loss) from continuing operations	286	(29)	605	245
Less: Net income attributable to non-controlling interests	7	6	13	10
Net income (loss) from continuing operations attributable to the Company	279	(35)	592	235
Less: Portion attributable to participating securities	1	(1)	4	4
Net income (loss) attributable to common shares for diluted earnings per share	$ 278	$ (35)	$ 588	$ 231
Basic weighted average common shares outstanding	547	541	545	537
Dilutive effect of potentially issuable common shares	8		9	4
Diluted weighted average common shares outstanding	555	541	554	541
Average stock price used to calculate common stock equivalents	$ 30.03	$ 23.16	$ 29.47	$ 23.00

This element represents the income or loss from continuing operations attributable to the parent which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any.

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.5-03.13)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

+ References+ Details

- Definition

The portion of net Income or Loss attributable to the noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent.

+ References

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+ Details

- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
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+ Details