NOTES PAYABLE, LONG-TERM DEBT AND AVAILABLE CREDIT FACILITIES (Narrative) € in Millions, $ in Millions	1 Months Ended			3 Months Ended			12 Months Ended
	Sep. 30, 2020 USD ($)	Aug. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 15, 2021 USD ($)	Aug. 31, 2020 EUR (€)	Feb. 28, 2020 EUR (€)	Oct. 01, 2019 USD ($)	May 31, 2019 USD ($)	Nov. 30, 2018 USD ($)
Debt Instrument [Line Items]
Loss on early extinguishment of debt							$ (149)	$ (102)	$ (54)
Total notes payable							156	586
Repayments of Long-term Debt							134
Proceeds from issuance of long-term debt							4,672	2,287	1,999
Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt								16
Notes payable to banks and other lenders
Debt Instrument [Line Items]
Total notes payable							156	435
Uncommitted Credit Facility [Member] | Notes payable to banks and other lenders
Debt Instrument [Line Items]
Total notes payable					$ 800
Tax-exempt bonds, varying maturities through 2038 | Sundry Income (Expense), Net
Debt Instrument [Line Items]
Loss on early extinguishment of debt									6
Euros Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance | €												€ 2,250
Stated interest rate												1.00%
0.50 Percent Notes Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance | €												€ 1,000
Stated interest rate												0.50%
1.125 Percent Notes Due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance | €												€ 750
Stated interest rate												1.125%
1.875 Percent Notes Due 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance | €												€ 500
Stated interest rate												1.875%
Term Loan Facility, Due September 2023 [Member] | Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of Debt		$ 1,250			$ 750
3.0 Percent Notes Due 2022 [Member]
Debt Instrument [Line Items]
Stated interest rate					3.00%
Repayments of Notes Payable					$ 1,250
3.0 Percent Notes Due 2022 [Member] | Sundry Income (Expense), Net
Debt Instrument [Line Items]
Loss on early extinguishment of debt					$ 85
U.S. Dollar Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance | €											€ 2,000
Proceeds from Issuance of Long-term Debt	$ 556
2.1 Percent Notes Due 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance | €											€ 850
Stated interest rate											2.10%
3.6 Percent Notes Due 2050 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance | €											€ 1,150
Stated interest rate											3.60%
Debt Securities [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 493
Debt Securities [Member] | Sundry Income (Expense), Net
Debt Instrument [Line Items]
Loss on early extinguishment of debt				$ 62
InterNotes redeemed
Debt Instrument [Line Items]
Repayments of Notes Payable							180	122	91
Notes Issued							190	$ 277
InterNotes redeemed, Various maturities [Member]
Debt Instrument [Line Items]
Repayments of Notes Payable							400
InterNotes redeemed, Various maturities [Member] | Sundry Income (Expense), Net
Debt Instrument [Line Items]
Loss on early extinguishment of debt							2
InterNotes [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Debt Instrument, Notice to Call, Amount										$ 118
Senior Unsecured Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance														$ 2,000	$ 2,000
Senior Unsecured Notes, 4 Point 80 Percent, Due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance														$ 750
Stated interest rate													4.80%	4.80%
Senior Unsecured Notes, 3 Point 625 Percent, Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance														$ 750
Stated interest rate													3.625%	3.625%
Senior Unsecured Notes, 3 Point 15 Percent, Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance														$ 500
Stated interest rate													3.15%	3.15%
Four Point Two Five Percent Notes [Member]
Debt Instrument [Line Items]
Stated interest rate								4.25%
Repayments of Notes Payable								$ 1,500
Four Point Two Five Percent Notes [Member] | Sundry Income (Expense), Net
Debt Instrument [Line Items]
Loss on early extinguishment of debt								$ 100
Four Point One Two Five Percent Notes Due 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate								4.125%
Repayments of Notes Payable								$ 1,250
Long Term Debt Repayment - Variable Interest Entity
Debt Instrument [Line Items]
Repayments of Debt							$ 29	$ 149	$ 138
Term Loan Facility, Due December 2023 [Member]
Debt Instrument [Line Items]
Repayments of Debt						$ 2,500
Term Loan Facility, Due December 2023 [Member] | Sundry Income (Expense), Net
Debt Instrument [Line Items]
Loss on early extinguishment of debt						$ 2
Exchangeable Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance													$ 4,000
5.7% Notes Due 2018 | Promissory notes and debentures
Debt Instrument [Line Items]
Stated interest rate			5.70%						5.70%
Principal amount redeemed			$ 333						$ 333
Tax-exempt Bonds, varying maturities through 2038
Debt Instrument [Line Items]
Repayments of Debt									$ 343
Senior Unsecured Notes, 5 .55%, Due 2048
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance															$ 900
Stated interest rate													5.55%		5.55%
Senior Unsecured Notes, 4.80%, Due 2028
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance															$ 600
Stated interest rate													4.80%		4.80%
Senior Unsecured Notes, 4.55%, Due 2025
Debt Instrument [Line Items]
Debt Instrument, Face Amount on Issuance															$ 500
Stated interest rate													4.55%		4.55%
8.55% Notes Retired
Debt Instrument [Line Items]
Stated interest rate			8.55%						8.55%
Repayments of Notes Payable			$ 2,100
8.55% Notes Retired | Sundry Income (Expense), Net
Debt Instrument [Line Items]
Loss on early extinguishment of debt			$ 48