Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	86
Number of years taken to calculate forfeiture rate	15 years
Share-based compensation cost	$ 70	$ 86	$ 92
Maximum term in years for non-qualified and incentive stock options	10 years
In-the-money options	20
Weighted-average grant-date fair value for options granted	$ 4.95	$ 9.22	$ 8.56
Total fair value of options vested	47	57	63
Proceeds from the exercise of stock options	38	90	55
Total intrinsic value of options exercised	51	77	57
Awards to retirement eligible employees, service period	12 months
Age of retirement eligibility	55 years
Years of historical volatility included in cost recent volatility	15 years
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable period from date of grant, in years	1 year
Incentive Stock Plans contractual lives	5 years 8 months 12 days	5 years 1 month 6 days	5 years 1 month 6 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercisable period from date of grant, in years	5 years
Incentive Stock Plans contractual lives	7 years 1 month 6 days	6 years 8 months 12 days	6 years 6 months
Time-Based Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of equity instruments other than options vested	13	15	11
Compensation cost	31	29	23
Unrecognized compensation cost	22
Weighted-average period to recognize the cost	2 years
Performance-Based Restricted Stock And Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of equity instruments other than options vested	45	10	44
Compensation cost	2	9	14
Options vesting period, years	3 years
Incentive Stock Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Plans vest over a period minimum	1 year
Incentive Stock Plans vest over a period maximum	10 years
Expected term for grants Incentive Stock Plans minimum	1 year
Expected term for grants Incentive Stock Plans maximum	10 years
Incentive Stock Plans [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Plans contractual lives	1 year
Incentive Stock Plans [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive Stock Plans contractual lives	10 years
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	37	48	53
Unrecognized compensation cost	$ 23
Weighted-average period to recognize the cost	2 years

Age of retirement eligibility.

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Awards to retirement eligible employees, service period

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Expected Term For Grants Incentive Stock Plans Minimum

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In the money options

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Years of historical volatility included in the calculation of the forfeiture rate and then it is adjusted if actual forfeitures differ significantly from the original estimates.

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Stock options exercisable period from date of grant.

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Years of Historical Volatility Included in Most Recent Volatility

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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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-Paragraph A240

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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