Shareholders' Equity (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended
	Apr. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Apr. 04, 2012	Dec. 31, 2011	Sep. 30, 2012 Continuing operations	Sep. 30, 2011 Continuing operations	Sep. 30, 2012 Continuing operations	Sep. 30, 2011 Continuing operations	Jan. 31, 2010 2010 - Share Repurchase Program	Mar. 31, 2012 2010 - Share Repurchase Program	Sep. 30, 2012 2010 - Share Repurchase Program	Apr. 30, 2012 2012 - Share Repurchase Program	Sep. 30, 2012 2012 - Share Repurchase Program	Sep. 30, 2012 2012 - Share Repurchase Program
Common Stock Programs
Treasury stock shares cancelled (in shares)	60.0
Impact of cancellation of treasury shares on ordinary shares	$ 60,000,000
Impact of cancellation of treasury shares on Retained earnings	2,400,000,000
Cost of treasury stock shares eliminated	2,500,000,000
Common stock, par value before redomestication (in dollars per share)	$ 1.00
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01		$ 0.01			$ 1.00
Impact of redomestication in ordinary shares	323,000,000
Impact of redomestication on additional paid-in-capital	323,000,000
Distributable reserves available amount						8,000,000,000
Share repurchase authorization limit												2,000,000,000			5,000,000,000
Number of shares repurchased (in shares)													2.1	12.7		5.4	12.7
Average price per share of shares purchased under share repurchase program (in dollars per share)													$ 48.32	$ 49.22		$ 51.37	$ 49.22
Cost of shares repurchased				625,000,000									100,000,000	625,000,000		275,000,000	625,000,000
Share repurchase, remaining authorization limit																	4,500,000,000
Cumulative number of shares purchased under share repurchase programs (in shares)													18.2
Cumulative value of shares purchased under share repurchase programs													913,000,000
Participating Securities
Income from continuing operations		$ 2,000,000	$ 3,000,000	$ 8,000,000	$ 11,000,000			$ 2,000,000	$ 3,000,000	$ 8,000,000	$ 11,000,000
Weighted average shares outstanding
Shares for basic earnings per share		327.3	332.6	330.6	336.7
Common stock equivalents (in shares)		3.7	4.3	3.8	5.1
Shares for diluted earnings per share		331.0	336.9	334.4	341.8
Number of participating securities (in shares)		4.5	5.2	4.7	5.5
Number of shares excluded from the calculation of diluted earnings per share		0.1	1.0	0.1	0.1