Per Share Data (Diluted EPS Calculation Continuing Operations) (Details) (USD $) In Millions, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net income from continuing operations	$ 133	$ 128	$ 738	$ 373
Less: Net income attributable to non-controlling interests	5	3	18	13
Basic weighted average common shares outstanding	540	543	543	539
Weighted Average Number of Shares Outstanding, Diluted	549	548	552	543
Continuing Operations [Member]
Net income from continuing operations	133	128	738	373
Less: Net income attributable to non-controlling interests	5	3	18	13
Net income from continuing operations attributable to the Company	128	125	720	360
Less: Portion attributable to participating securities	1	3	5	7
Net income attributable to common shares for diluted earnings per share	$ 127	$ 122	$ 715	$ 353
Basic weighted average common shares outstanding	540	543	543	539
Dilutive effect of potentially issuable common shares	9	5	9	4
Weighted Average Number of Shares Outstanding, Diluted	549	548	552	543
Average stock price used to calculate common stock equivalents	$ 28.87	$ 23.58	$ 29.27	$ 23.19

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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+ 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 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.

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-Glossary Weighted-Average Number of Common Shares Outstanding

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+ Details