STOCKHOLDERS’ EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended							9 Months Ended
	Mar. 31, 2021	Feb. 28, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 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	$ 0.62	$ 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										$ 1,910,000,000	$ 75,000,000
Accelerated share repurchase, initial purchase price, per share										$ 132.27
Reissuance of shares for employee benefit plan										1.7	2.1
Treasury stock retired (in shares)			55.0
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										$ 1,610,000,000	$ 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
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
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%
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