EMPLOYEE STOCK BENEFIT PLANS - Share-based Payment Arrangement, Nonvested Award, Cost (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Stock Options
Unrecognized compensation cost	$ 1
Expected weighted-average period in years of compensation cost to be recognized	3 months 18 days
Restricted stock units
Unrecognized compensation cost	$ 919
Expected weighted-average period in years of compensation cost to be recognized	3 years 1 month 6 days
Market share units
Unrecognized compensation cost	$ 76
Expected weighted-average period in years of compensation cost to be recognized	3 years 2 months 12 days
Performance share units
Unrecognized compensation cost	$ 132
Expected weighted-average period in years of compensation cost to be recognized	2 years