The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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The per share price that the individual must pay to acquire shares under the deferred compensation arrangement.

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Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date.

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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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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, 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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Employee Stock-Based Incentives - Employee Stock-Based Awards (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2008
Employee stock-based awards general disclosures
Deferred compensation arrangement with individual, compensation expense	$ 3	$ 14	$ 5
Stock Appreciation Rights (SARs)
Employee stock-based awards general disclosures
Award vesting period	5 years
Award vesting percentage	20.00%
Award expiration period	10 years
Stock Appreciation Rights (SARs) \| Chief Executive Officer
Employee stock-based awards general disclosures
Deferred compensation arrangement with individual, shares authorized for issuance	2,000,000
Deferred compensation arrangement with individual, exercise price	$ 39.83
Deferred compensation arrangement with individual, requisite service period	6 years 6 months			5 years
2nd 50% \| Restricted Stock Units (RSUs)
Employee stock-based awards general disclosures
Award vesting period	3 years
1st 50% \| Restricted Stock Units (RSUs)
Employee stock-based awards general disclosures
Award vesting period	2 years
Long-Term Incentive Plan
Employee stock-based awards general disclosures
Shares of common stock available for issuance	266,000,000