EMPLOYEE STOCK BENEFIT PLANS Share-based Payment Arrangement, Nonvested Award, Cost (Details) $ in Millions	3 Months Ended
	Jun. 30, 2021 USD ($)
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 20
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	10 months 24 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 953
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 9 months 18 days
Market share units [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 73
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	3 years 2 months 12 days
Performance Shares [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 124
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years