Earnings per share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share, Basic And Diluted

	Three Months Ended
	March 31
(in millions of U.S. dollars, except share and per share data)	2013		2012
Numerator:
Net income	$	953	$	973
Denominator:
Denominator for basic earnings per share:
Weighted-average shares outstanding	340,778,142		338,567,341
Denominator for diluted earnings per share:
Share-based compensation plans	3,128,226		3,123,641
Adjusted weighted-average shares outstanding and assumed conversions	343,906,368		341,690,982
Basic earnings per share	$	2.80	$	2.87
Diluted earnings per share	$	2.77	$	2.84
Potential anti-dilutive share conversions	634,385		468,048