FINANCING - Diluted Earnings Per Share (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
As reported shares	1,058	1,046	1,020
Effect of stock-based compensation	7	8	5
Diluted shares	1,065	1,054	1,025