LEASES - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating right-of-use lease assets included within other long-term assets	$ 410
Operating lease liabilities included within trade accounts payable and accrued expenses	116
Operating lease liabilities included within other long-term liabilities	332
Fixed operating lease costs	154
Variable lease costs	82
Sublease rental income	$ 45
Weighted average remaining lease term (in years)	4 years 10 months 24 days
Weighted average discount rate (percent)	4.10%
Operating lease cash payments	$ 151