DEBT - Schedule of Debt (Detail) - USD ($)	Feb. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 8,580,000,000
Total debt		8,484,000,000	$ 8,544,000,000
Long-term debt		7,934,000,000	8,544,000,000
Commercial Paper
Debt Instrument [Line Items]
Total debt		0	0
Unsecured Debt
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		8,580,000,000	8,650,000,000
Unamortized discount		(47,000,000)	(50,000,000)
Deferred loan costs		(49,000,000)	(56,000,000)
Total debt		8,484,000,000	8,544,000,000
Current maturities		(550,000,000)	0
Long-term debt		7,934,000,000	8,544,000,000
Unsecured Debt | 6.9% notes due 2018
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 400,000,000	400,000,000
Debt interest rate		6.90%
Unsecured Debt | 7.0% notes due 2018
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 150,000,000	150,000,000
Debt interest rate		7.00%
Unsecured Debt | 7.625% notes due 2019
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 150,000,000	150,000,000
Debt interest rate		7.625%
Unsecured Debt | 3.625% notes due 2021
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 493,000,000	493,000,000
Debt interest rate		3.625%
Unsecured Debt | 3.25% notes due 2022
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 814,000,000	857,000,000
Debt interest rate		3.25%
Unsecured Debt | 2.625% notes due 2023
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 528,000,000	528,000,000
Debt interest rate		2.625%
Unsecured Debt | 7.7% notes due 2026
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 100,000,000	100,000,000
Debt interest rate		7.70%
Unsecured Debt | 7.95% notes due 2026
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 180,000,000	180,000,000
Debt interest rate		7.95%
Unsecured Debt | 7.75% notes due in 2029
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 300,000,000	300,000,000
Debt interest rate		7.75%
Unsecured Debt | 6.0% notes due 2037
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 1,000,000,000	1,000,000,000
Debt interest rate		6.00%
Unsecured Debt | 5.1% notes due 2040
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 1,499,000,000	1,499,000,000
Debt interest rate		5.10%
Unsecured Debt | 5.25% notes due 2042
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 500,000,000	500,000,000
Debt interest rate		5.25%
Unsecured Debt | 4.75% notes due 2043
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 1,413,000,000	1,413,000,000
Debt interest rate		4.75%
Unsecured Debt | 4.25% notes due 2044
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 753,000,000	780,000,000
Debt interest rate		4.25%
Unsecured Debt | 7.375% debentures due 2047
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 150,000,000	150,000,000
Debt interest rate		7.375%
Unsecured Debt | 7.625% debentures due 2096
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 150,000,000	150,000,000
Debt interest rate		7.625%
Unsecured Debt | Commercial Paper
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs		$ 0	$ 0
Subsequent Event | Unsecured Debt | 7.0% notes due 2018
Debt Instrument [Line Items]
Debt before unamortized discount and deferred loan costs	$ 150,000,000
Debt interest rate	7.00%