v2.4.0.8

Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants received by certain executive officers and a select group of non officer employees	800,425			800,425
Common stock shares reserved for future issuance	2,600,000			2,600,000
ESPP discount from market price	15.00%		15.00%	15.00%		15.00%
Net cash proceeds from the exercise of stock options	$ 2		$ 1	$ 18		$ 3
Stock options exercised in period	171,458		159,282	1,730,647	[1]	318,406
Stock options, exercisable	3,765,289	[1]	5,700,000	3,765,289	[1]	5,700,000
Weighted-average exercise price	$ 25.06		$ 15.47	$ 25.06		$ 15.47
Total pre-tax intrinsic value of stock options exercised	3		2	36		5
Stock options, granted	0			0
Closing stock price	$ 32.11			$ 32.11
Total number of in-the-money stock options exercisable	2,500,000			2,500,000
Restricted stock and PSU's [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	93			93
Weighted-average period unrecognized compensation cost is expected to be recognized, in years				1 year 9 months 18 days
PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target amount granted, minimum				0.00%
Percentage of target amount granted, maximum				150.00%
Performance period (year)				3 years
Number of peer groups	2			2
Performance-based long-term incentive program weighted percentage				50.00%
Minimum payout				0.00%
Maximum payout				200.00%
PSUs [Member] | Chief executive officer's and executive vice presidents' [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Chief executive officer's and executive vice presidents' long-term stock-based compensation				100.00%
PSUs [Member] | Senior vice presidents' [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Chief executive officer's and executive vice presidents' long-term stock-based compensation				50.00%
PSUs [Member] | One-year performance period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants received by certain executive officers and a select group of non officer employees	269,238			269,238
PSUs [Member] | Three-year performance period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants received by certain executive officers and a select group of non officer employees	531,187			531,187
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General expiration period of stock options				10 years
Grant vesting period, expectation exceeds, years				third
Grant vesting period, expectation met, years				fourth
Grant vesting period, expectation not met, years				fifth
Restricted stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting range				3 years
Restricted stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting range				5 years
Non-qualified stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost	$ 2			$ 2
Weighted-average period unrecognized compensation cost is expected to be recognized, in years				1 year
[1] No stock option awards were granted during the three and nine months ended September 30, 2013.

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Total Number Of In The Money Stock Options Exercisable

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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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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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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Discount rate from fair value on purchase date that participants pay for shares.

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Net number of share options (or share units) granted during the period.

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Price of a single share of a number of saleable stocks of a company.

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