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STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) - Repurchase Program - USD ($) | Mar. 31, 2019 | Jan. 31, 2019
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Equity, Class of Treasury Stock [Line Items] |  |
Remaining amount of share repurchases authorized | $ 2,000,000,000 |
Common Stock |  |
Equity, Class of Treasury Stock [Line Items] |  |
Amount of share repurchases authorized | $ 7,500,000,000.0 |
Stock repurchase program, increased to authorized amount |  | $ 2,000,000,000.0

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