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STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Details) - USD ($) $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
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Mar. 31, 2021 | Feb. 28, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Apr. 30, 2021 | Apr. 01, 2021 | Jul. 01, 2015
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends per common share |  |  | $ 0.62 | $ 0.62 | $ 0.56 | $ 0.56 | $ 0.56 | $ 0.56 |  |  |  |  |
Additional amount authorized | $ 1,000,000,000 | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Share repurchase authorization remaining available |  |  | $ 1,300,000,000 |  |  |  |  |  | $ 1,300,000,000 |  |  |  |
Purchases of treasury stock, value |  |  | $ 1,500,000,000 |  |  |  |  |  | $ 1,910,000,000 | $ 75,000,000 |  |  |
Accelerated share repurchase, initial purchase price, per share |  |  | $ 132.27 |  |  |  |  |  |  |  |  |  |
Reissuance of shares for employee benefit plan |  |  |  |  |  |  |  |  | 1.2 | 1.7 |  |  |
UMass Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners |  |  |  |  |  |  |  |  |  |  |  |  | 18.90%
ASRs |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchases |  |  |  |  |  |  |  |  |  |  | $ 1,500,000,000 |  |
Value of shares to be received under accelerated share repurchase agreements at execution |  |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase, percent of total value to be repurchased |  |  | 80.00% |  |  |  |  |  |  |  |  |  |
Treasury Stock, at Cost |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock- shares |  |  |  |  |  |  |  |  | 12.5 | 0.7 |  |  |
Purchases of treasury stock, value |  |  | $ 1,200,000,000 |  |  |  |  |  | $ 1,610,000,000 | $ 75,000,000 |  |  |
Treasury Stock, at Cost | ASRs |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock- shares |  |  | 9.1 |  |  |  |  |  | 9.1 |  |  |  |
Stockholders' equity, period Increase (decrease) |  |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock, value |  |  | 300,000,000 |  |  |  |  |  | $ 300,000,000 |  |  |  |
Additional Paid-In Capital | ASRs |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity, period Increase (decrease) |  |  | (300,000,000) |  |  |  |  |  |  |  |  |  |
Amount recorded in additional paid-in capital that will be included in treasury stock upon completion of the accelerated share repurchase agreements |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |
Q2 Solutions | Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of ownership interest sold |  |  |  |  |  |  |  |  |  |  |  | 40.00% |
Loss on sale of investment, before tax |  |  | 314,000,000 |  |  |  |  |  |  |  |  |  |
Q2 Solutions | Disposed of by Sale | Foreign Currency Translation |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Stockholders' Equity and Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive (loss) income |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |

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