Share-Based Incentive Compensation (details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 years count	Jun. 30, 2010	Dec. 31, 2010 years
Share-Based Incentive Compensation disclosure
Stock options vested at end of period, number (in shares)	13,433,507		13,433,507
Stock options vested at end of period, weighted average exercise price (per share)	$ 46.38		$ 46.38
Stock options vested at end of period, weighted average contractual life remaining (in years)			4.6
Stock options vested at end of period, aggregate intrinsic value	$ 163		$ 163
Stock options exercisable at end of period, number (in shares)	9,646,852		9,646,852
Stock options exercisable at end of period, weighted average exercise price (per share)	$ 44.68		$ 44.68
Stock options exercisable at end of period, weighted average contractual life remaining (in years)			3.6
Stock options exercisable at end of period, aggregate intrinsic value	132		132
Total compensation cost recognized in earnings for all share-based incentive compensation awards	30	29	67	71
Tax benefits recognized in the consolidated statement of income (loss) related to compensation costs	10	10	23	25
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards	$ 164		$ 164		$ 112
Weighted-average period of recognition for unrecognized compensation cost (in years)			2.0		1.7

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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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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