LEASES Operating lease (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Weighted Average Discount Rate	2.00%
Weighted Average Remaining Lease Term	7 years 9 months 18 days
Finance Leases	$ 0
Leases, Operating [Abstract]
Operating lease assets	620	$ 0
Current operating lease liabilities	161
Non-current operating lease liabilities	462	0
Total operating lease liabilities	623
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	172
2021	151
2022	100
2023	62
2024	42
Thereafter	163
Total remaining lease payments	690
Less: Imputed interest	(67)
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Minimum lease payments related to operating lease which have not yet commenced	10
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019		164
2020		142
2021		110
2022		66
2023		52
Thereafter		190
Total minimum lease payments		724
Income and Expenses, Lessee [Abstract]
Lease expense	183
Variable lease expense	56
Sublease Income	(2)
Total lease expense, net of sublease income	237
Rent expense under ASC 840		$ 149	$ 120
Cash Flow, Operating Activities, Lessee [Abstract]
Cash paid for amounts included in the measurement of lease liabilities	189
Operating lease assets obtained in exchange for operating lease liabilities	$ 155
Maximum
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Lease term of operating leases which have not yet commenced	5 years