Shareholders' Equity (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended								12 Months Ended				12 Months Ended			1 Months Ended		12 Months Ended
	Apr. 30, 2012	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Apr. 04, 2012	Dec. 31, 2012 Continuing operations	Dec. 31, 2011 Continuing operations	Dec. 31, 2010 Continuing operations	Jan. 31, 2010 2010 - Stock Repurchase Program	Apr. 30, 2012 2012 - Share Repurchase Program	Dec. 31, 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				$ 1.00				$ 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		7,000,000,000								7,000,000,000			8,000,000,000
Share repurchase authorization limit																	2,000,000,000	5,000,000,000
Number of shares repurchased (in shares)																			21.6
Average price per share of shares purchased under share repurchase program (in dollars per share)																			$ 52.16
Cost of shares repurchased										1,125,000,000	828,000,000	250,000,000							1,100,000,000
Share repurchase, remaining authorization limit																			4,000,000,000
Participating Securities
Income from continuing operations										11,000,000	13,000,000	15,000,000		11,000,000	13,000,000	15,000,000
Weighted average shares outstanding
Shares for basic earnings per share										328.5	335.5	293.4
Ordinary share equivalents										4.1	5.4	4.7
Shares for diluted earnings per share										332.6	340.9	298.1
Number of participating securities (in shares)										4.7	7.6	6.1
Number of shares excluded from the calculation of diluted earnings per share										0.2	0.1	4.8
Dividends paid on ordinary shares										$ 204,000,000	$ 200,000,000	$ 175,000,000
Dividends paid per ordinary share (in dollars per share)		$ 0.16	$ 0.16	$ 0.16	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.62	$ 0.60	$ 0.60