EQUITY METHOD INVESTMENT - Summarized Balance Sheets and Statements of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance sheets
Current assets	$ 23,641	$ 19,888
Current liabilities	13,394	10,929
Shareholders' equity	13,728	12,037	$ 10,161	$ 9,842
Statements of income
Revenues	77,155	64,888	56,912
Net income	3,367	2,707	$ 1,683
Kindred at Home
Balance sheets
Current assets	844	563
Non-current assets	4,858	4,967
Current liabilities	556	405
Non-current liabilities	2,445	2,637
Shareholders' equity	2,700	2,488
Statements of income
Revenues	2,972	3,100
Expenses	2,552	2,835
Net income	$ 207	$ 54