v2.4.0.6

Equity-Based Compensation Information Related to Stock Options (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of stock options
Pretax expense for stock options	$ 7	$ 5	$ 11
After-tax expense for stock options	5	4	8
Proceeds from stock options exercised	95	71	157
Income tax benefit related to stock options exercised
Tax benefit classified in operating activities in the Consolidated Statements of Cash Flows	5	13	0
Excess tax benefit classified in financing activities in the Consolidated Statements of Cash Flows	13	33	0
Intrinsic value of stock options exercised	60	62	98
Total fair value of stock options vesting	7	5	11
Stock options exercised, shares	3,099	2,541	6,096
Non-vested stock option compensation expense not yet recognized	$ 12
Non-vested stock options weighted average period for total compensation expense to be recognized	1 year 10 months

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Excess tax benefit for stock options exercised classified in Consolidated Statements of Cash Flows excluding RSU's

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Tax benefit for stock options exercised classified in operating activities excluding RSU's.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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

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