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NOTES PAYABLE, LONG-TERM DEBT AND AVAILABLE CREDIT FACILITIES Long-Term Debt (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Oct. 01, 2019	May 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance lease obligations 1		$ 425		$ 425
Unamortized debt discount and issuance costs		(335)		(335)				$ (334)
Long-term debt due within one year 2		(378)		(378)				(338)
Long-term debt		17,213		17,213				$ 19,253
Long-term Debt, Maturities, Repayments of Principal, 2019		97		97
Long-term Debt, Maturities, Repayments of Principal, 2020		379		379
Long-term Debt, Maturities, Repayments of Principal, 2021		1,763		1,763
Long-term Debt, Maturities, Repayments of Principal, 2022		1,514		1,514
Long-term Debt, Maturities, Repayments of Principal, 2023		2,509		2,509
Long-term Debt, Maturities, Repayments of Principal, 2024		1,493		1,493
Line of Credit Facility, Maximum Borrowing Capacity		9,617		9,617
Gain (Loss) on Extinguishment of Debt		0	$ (6)	(44)	$ (6)
Proceeds from issuance of long-term debt				2,146	0
Sundry Income (Expense), Net [Member]
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt					(7)
Variable Interest Entity, Primary Beneficiary [Member]
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt				16
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 [Member]
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt				(2)
Term Loan Facility, Due December 2023 [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 2,000		$ 2,000
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 2,000
Senior Unsecured Notes, 4 Point 80 Percent, Due 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 750
Debt Instrument, Interest Rate, Stated Percentage						4.80%	4.80%
Senior Unsecured Notes, 3 Point 625 Percent, Due 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 750
Debt Instrument, Interest Rate, Stated Percentage						3.625%	3.625%
Senior Unsecured Notes, 4 Point 80 Percent, Due 2028 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						4.80%
Senior Unsecured Notes, 5 Point 55 Percent, Due 2048 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						5.55%
Senior Unsecured Notes, 3 Point 15 Percent, Due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount							$ 500
Debt Instrument, Interest Rate, Stated Percentage						3.15%	3.15%
Senior Unsecured Notes, 4 Point 55 Percent, Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						4.55%
Four Point Two Five Percent Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.25%		4.25%
Repayments of Notes Payable	$ 1,500
Four Point Two Five Percent Notes [Member] \| Sundry Income (Expense), Net [Member]
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt				$ (42)
InterNotes redeemed [Member]
Debt Instrument [Line Items]
Repayments of Notes Payable				117	86
Notes Issued				136
Long Term Debt Repayment - Variable Interest Entity [Member]
Debt Instrument [Line Items]
Repayments of Debt				136	75
Four Point One Two Five Percent Notes Due 2021 [Member]
Debt Instrument [Line Items]
Debt Instrument, Notice to Call, Amount		$ 1,250		$ 1,250
Debt Instrument, Notice to Call, Percent		4.125%		4.125%
Exchangeable Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 4,000
Tax-exempt Bonds, varying maturities through 2038 [Member]
Debt Instrument [Line Items]
Repayments of Debt					$ 343
Loans Payable [Member] \| Promissory Notes and Debentures, Final Maturity, Current Year [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		9.80%		9.80%				9.80%
Long-term Debt, Gross		$ 3		$ 3				$ 7
Loans Payable [Member] \| Promissory Notes and Debentures, Final Maturity, Year One [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		8.44%		8.44%				4.46%
Long-term Debt, Gross		$ 76		$ 76				$ 1,547
Loans Payable [Member] \| Promissory Notes and Debentures, Final Maturity, Year Two [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		4.71%		4.71%				4.71%
Long-term Debt, Gross		$ 1,424		$ 1,424				$ 1,424
Loans Payable [Member] \| Promissory Notes and Debentures, Final Maturity, Year Three [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		3.50%		3.50%				3.50%
Long-term Debt, Gross		$ 1,372		$ 1,372				$ 1,373
Loans Payable [Member] \| Promissory Notes and Debentures, Final Maturity, Year Four [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		7.64%		7.64%				7.64%
Long-term Debt, Gross		$ 325		$ 325				$ 325
Loans Payable [Member] \| Promissory Notes and Debentures, Final Maturity, Year Five [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		3.37%		3.37%				3.50%
Long-term Debt, Gross		$ 1,397		$ 1,397				$ 896
Loans Payable [Member] \| Promissory Notes and Debentures, Final Maturity, Year Six and Thereafter [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		5.70%		5.70%				5.98%
Long-term Debt, Gross		$ 9,507		$ 9,507				$ 7,963
Loans Payable [Member] \| U.S. Dollar Loans [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		2.80%		2.80%				3.59%
Long-term Debt, Gross		$ 2,000		$ 2,000				$ 4,533
Loans Payable [Member] \| Foreign Currency Loans [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		3.33%		3.33%				3.20%
Long-term Debt, Gross		$ 605		$ 605				$ 708
Medium-term Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time		3.44%		3.44%				3.26%
Long-term Debt, Gross		$ 792		$ 792				$ 778
Finance Leases [Member]
Debt Instrument [Line Items]
Finance lease obligations 1		$ 425		$ 425				$ 371
Five Point Seven Percent Notes Due 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.70%		5.70%
Repayments of Notes Payable					$ 333