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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Debt Obligations) (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 EUR (€)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
Number of Revolving Credit Facilities	3				3
Line of Credit Facility, Maximum Borrowing Capacity	$ 5,000
Debt Instrument [Line Items]
Commercial Paper	0	$ 299
Short-term Bank Loans and Notes Payable	320	512
Current portion of long-term debt	1,249	0
Other short-term debt	134	176
Short term debt	1,703	987
Debt Instrument, Face Amount	6,776	6,835
Adjustments to Principal Value, Unamortized basis adjustment from swap terminations	201	227
Adjustments to Principal Value, Unamortized bond discounts and issuance costs	(72)	(81)
Long-term Debt	6,895	6,975				$ 5,687	$ 5,671	$ 5,775	$ 6,982	$ 6,911	$ 7,237
Long-term debt, excluding current maturities	5,646	6,975
Long-term debt, Fair value	7,093	7,453
Proceeds from Issuance of Long-term Debt	0	1,488	$ 0
Interest payments	212	215	191
Extinguishment of Debt, Principal Value		337
Extinguishment of Debt, Carrying Value		366
Extinguishment of Debt, Repurchase Price		474
Gain (Loss) on Extinguishment of Debt	0	109	$ 0
Securities Borrowed, Fair Value of Collateral	1,000
United States of America, Dollars
Debt Instrument [Line Items]
Debt Instrument, Face Amount	1,500
Proceeds from Issuance of Long-term Debt	1,488
Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500	500
1.600% Notes due 2019
Debt Instrument [Line Items]
Debt Instrument, Face Amount	750	750
1.600% Notes due 2019 \| United States of America, Dollars
Debt Instrument [Line Items]
Debt Instrument, Face Amount	750
2.000% Notes due 2022
Debt Instrument [Line Items]
Debt Instrument, Face Amount	750	750
7.150% Notes due 2023
Debt Instrument [Line Items]
Debt Instrument, Face Amount	302	302
3.250% Notes due 2023
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500	500
1.000% Euro Notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Face Amount	655	682
6.800% Notes due 2026
Debt Instrument [Line Items]
Debt Instrument, Face Amount	256	256
3.250% Notes due 2027
Debt Instrument [Line Items]
Debt Instrument, Face Amount	750	750
3.250% Notes due 2027 \| United States of America, Dollars
Debt Instrument [Line Items]
Debt Instrument, Face Amount	750
1.750% Euro Notes due 2035
Debt Instrument [Line Items]
Debt Instrument, Face Amount	655	682
5.875% Notes due 2036
Debt Instrument [Line Items]
Debt Instrument, Face Amount	287	287
6.125% Notes due 2038
Debt Instrument [Line Items]
Debt Instrument, Face Amount	226	230
3.250% Notes due 2042
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500	500
4.500% Notes due 2044
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500	500
6.875% Notes due 2097
Debt Instrument [Line Items]
Debt Instrument, Face Amount	87	87
0.13% - 5.75% Other - maturing 2019 - 2024
Debt Instrument [Line Items]
Debt Instrument, Face Amount	58	59
0.875% Notes due 2017 [Member]
Debt Instrument [Line Items]
Repayments of Notes Payable	750
Commercial Paper [Member]
Debt Instrument [Line Items]
Short term debt	0	299
The average amount of commercial paper outstanding	$ 19	$ 389
The weighted average interest rate of commercial paper	1.27%	1.17%
Short-term Debt, Maximum Amount Outstanding During Period	$ 300	$ 1,300
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative Liability	(10)	(6)
Interest Rate Swap [Member] \| United States of America, Dollars
Debt Instrument [Line Items]
Derivative Liability, Notional Amount	750
Realized gain on terminated forward swap contracts	6
Unrealized gain/(loss) from termination of forward interest rate swap	(2)
$2 Billion Maximum Borrowing Capacity [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,000
$1.5 Billion Maximum Borrowing Capacity [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	1,500
Subsequent Event [Member] \| $2 Billion Maximum Borrowing Capacity [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 2,000
Subsequent Event [Member] \| $1 Billion Maximum Borrowing Capacity [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,000
Designated as Hedging Instrument [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	1,082				€ 950
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative Liability	$ (10)	$ (6)