EMPLOYEE STOCK BENEFIT PLANS - Share-based Payment Arrangement, Nonvested Award, Cost (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Stock Options
Unrecognized compensation cost	$ 3
Expected weighted-average period in years of compensation cost to be recognized	4 months 24 days
Restricted stock units
Unrecognized compensation cost	$ 1,003
Expected weighted-average period in years of compensation cost to be recognized	3 years 1 month 6 days
Market share units
Unrecognized compensation cost	$ 90
Expected weighted-average period in years of compensation cost to be recognized	3 years 4 months 24 days
Performance share units
Unrecognized compensation cost	$ 157
Expected weighted-average period in years of compensation cost to be recognized	2 years 2 months 12 days