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Share Based Compensation - Additional information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 11	$ 9	$ 25	$ 21
Share-based awards, stock options, granted			1.0	1.0
Share-based awards, restricted stock units, granted			0.4	0.3
Share-based awards, stock options, weighted-average estimated fair values			$ 21.58	$ 22.69
Share-based awards, restricted stock units, weighted-average estimated fair values			$ 65.33	$ 61.74
Share-based awards, stock options, exercised			1.0	1.1

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

Number of share options (or share units) exercised during the current period.

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