DEBT (Narrative) (Detail) - USD ($) $ in Millions		3 Months Ended					9 Months Ended
		Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Debt reductions	[1]	$ 90			$ 262		$ 1,479	$ 1,301
Debt instrument, maturity date range, start		Jan. 01, 2019			Jan. 01, 2015		Jan. 01, 2015	Jan. 01, 2018
Debt instrument, maturity date range, end		Jan. 01, 2030			Jan. 01, 2027		Jan. 01, 2030	Jan. 01, 2029
Debt tender premiums paid			$ (211)			$ (257)	$ 211	$ 269
Defined benefit plan employer cash contributions in current fiscal year							750	353
Write off of deferred debt issuance cost		$ 1			$ 13		$ 208	$ 275
Debt instrument, interest rate, stated percentage rate range, minimum		4.75%			4.75%		4.70%	4.75%
Debt instrument, interest rate, stated percentage rate range, maximum		5.85%			9.38%		9.38%	9.38%
Debt and capital lease obligations		$ 9,600					$ 9,600
Debt fair value		10,400					$ 10,400
Three Point Six Five Percentage Fixed Rate Loan [Member] [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage						3.65%
Proceeds from issuance of unsecured debt						$ 800
Debt instrument, maturity date						Jun. 15, 2024
Five Point Zero Percentage Fixed Rate Loan [Member] [Member] [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.00%
Proceeds from issuance of unsecured debt			$ 600
Debt instrument, maturity date			Sep. 15, 2035
Three Point Eight Percentage Fixed Rate Loan [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage						3.80%
Proceeds from issuance of unsecured debt			$ 700
Debt instrument, maturity date			Jan. 15, 2026
Four Point Eight Percentage Fixed Rate Loan [Member] [Member] [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage						4.80%
Proceeds from issuance of unsecured debt						$ 800
Debt instrument, maturity date						Jun. 15, 2044
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt reductions			$ 1,000			$ 957
Debt instrument, maturity date range, start			Jan. 01, 2018			Jan. 01, 2018
Debt instrument, maturity date range, end			Dec. 31, 2022			Jan. 01, 2019
Debt instrument, interest rate, stated percentage rate range, minimum			4.75%			7.95%
Debt instrument, interest rate, stated percentage rate range, maximum			9.38%		9.38%
Five Point One Five Percentage Fixed Rate Loan [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			5.15%
Proceeds from issuance of unsecured debt			$ 700
Debt instrument, maturity date			May 15, 2046
Secured Debt [Member]
Debt Instrument [Line Items]
Proceeds from issuance of secured debt		$ 300				$ 225
Debt instrument, interest rate, stated percentage		0.90%				0.90%	0.90%
Repayments of secured debt		$ 300				$ 225
Variable Rate [Domain]
Debt Instrument [Line Items]
Debt instrument, maturity date				Feb. 01, 2017
Debt reductions				$ 160
Early Debt Extinguishment Costs [Member]
Debt Instrument [Line Items]
Write off of deferred debt issuance cost			$ 207			$ 262

[1] Reductions related to notes with interest rates ranging from 4.75% to 5.85% with original maturities from 2019 to 2030 and from 4.75% to 9.38% with original maturities from 2015 to 2027 for the three months ended September 30, 2015 and 2014, respectively, and from 4.70% to 9.38% with original maturities from 2015 to 2030 and from 4.75% to 9.38% with original maturities from 2018 to 2029 for the nine months ended September 30, 2015 and 2014, respectively.