Earnings Per Share (EPS) (Details) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Weighted-average number of basic shares	307.7	327.7	305.4	331.0
Shares issuable under incentive stock plans	4.3	2.9	3.5	4.7
Exchangeable Senior Notes	0	9.6	4.0	11.4
Weighted-average number of diluted shares	312.0	340.2	312.9	347.1
Anti-dilutive shares	2.6	10.6	5.8	3.0
Exchangeable Senior Notes [Member]
Ordinary shares issued, shares, Exchangeable Senior Notes (in millions)			10.8

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

- Definition

Number of shares issued during the period as a result of the conversion of convertible securities.

+ References

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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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+ Details