Equity (Narrative) (Details) In Billions, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2011 USD ($)	Jun. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2011 Par Value US [Member] USD ($)	Dec. 31, 2011 Par Value Euro [Member] EUR (€)	Dec. 31, 2011 Ordinary shares [Member]	Dec. 31, 2011 Ordinary shares [Member] Par Value US [Member]	Dec. 31, 2011 Ordinary shares [Member] Par Value Euro [Member]	Dec. 31, 2011 Preferred Stock [Member]	Dec. 31, 2010 Preferred Stock [Member]
Stock repurchase program, authorized amount		$ 2.0
Stock repurchased and retired during period, shares							36,300,000
Stock repurchased and retired during period, value			$ 1.2
Authorized share capital	1,185,040,000		1,185,040,000
Number of ordinary shares								1,175,000,000	40,000
Ordinary shares, par value, in dollars or euros per share, as stated	$ 1.00		$ 1.00	$ 1.00	$ 1.00	€ 1.00
Number of preference shares										10,000,000
Preference shares, par value, in dollars per share					$ 0.001
No preference shares outstanding										0	0
Common stock, dividends, in dollars per share, declared	$ 0.16