LEASES Operating lease (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Finance leases	$ 0	$ 0
Weighted average remaining lease term of operating leases	8 years	8 years
Weighted average discount rate of operating leases	2.10%	2.10%
Leases, Operating [Abstract]
Operating lease assets	$ 610	$ 610	$ 0
Current operating lease liabilities	151	151
Non-current operating lease liabilities	466	466	0
Total operating lease liabilities	617	617
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Remainder of 2019	35	35
2020	166	166
2021	135	135
2022	88	88
2023	59	59
2024	42	42
Thereafter	160	160
Total remaining lease payments	685	685
Less: Imputed interest	(68)	(68)
Total operating lease liabilities	617	617
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Minimum lease payments related to operating leases which have not commenced at period end	32	32
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	46	137
Variable lease expense	14	42
Sublease income	0	(1)
Total lease expense, net of sublease income	$ 60	178
Cash Flow, Operating Activities, Lessee [Abstract]
Cash paid for amounts included in the measurement of lease liabilities		137
Operating lease assets obtained in exchange for operating lease liabilities		$ 116
Maximum
Lessee, Lease, Description [Line Items]
Initial term of renewal options	9 years	9 years
Lessee, Operating Lease, Not yet Commenced, Description [Abstract]
Lease term of operating leases which have not commenced at period end	7 years	7 years