SHARE-BASED COMPENSATION - Schedule of Stock Option Activity (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Options
Balance, beginning of year	17,055
Granted	2,463
Exercised	(5,294)
Forfeited or expired(1)	(1,939)
Balance, end of year	12,285
Exercisable, end of year	8,267
Number of options outstanding that have met the requisite service period and will be released as identifed in the grant terms	998
Weighted Average Exercise Price
Balance, beginning of year	$ 23.12
Granted	$ 30.14
Exercised	$ 22.50
Forfeited or expired(1)	$ 26.98
Balance, end of year	$ 24.19
Exercisable, end of year	$ 22.32
Weighted Average Remaining Contractual Term
Balance, end of year	5 years 3 months 7 days
Exercisable, end of year	3 years 9 months 22 days
Aggregate Intrinsic Value
Balance, end of year	$ 144
Exercisable, end of year	$ 112
Real Estate Divestiture
Options
Forfeited or expired(1)	(1,601)

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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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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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date and that have met the requisite service period and will be released as identified in the grant terms.

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No definition available.

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