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EQUITY - NON-QUALIFIED STOCK OPTION TRANSACTIONS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Shares |  |  |
Exercised (in shares) | (0.3) | (2.7) | (1.0)
Nonqualified Stock Options |  |  |
Shares |  |  |
Beginning balance (in shares) | 3.8 |  |
Granted (in shares) | 0.7 |  |
Exercised (in shares) | (0.3) |  |
Cancelled (in shares) | (0.2) |  |
Ending balance (in shares) | 4.0 | 3.8 |
Weighted Average Exercise Price |  |  |
Beginning balance (in dollars per share) | $ 50.02 |  |
Granted (in dollars per share) | 47.84 |  |
Exercised (in dollars per share) | 39.59 |  |
Cancelled (in dollars per share) | 56.21 |  |
Ending balance (in dollars per share) | $ 50.01 | $ 50.02 |
Aggregate Intrinsic Value |  |  |
Balance | $ 17 | $ 28 |
Exercisable |  |  |
Shares at year end (in shares) | 2.7 | 2.7 |
Weighted Average Exercise Price Exercisable (in dollars per share) | $ 50.28 | $ 48.85 |
Aggregate Intrinsic Value | $ 12 | $ 23 |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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