SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) SUPPLEMENTARY OIL AND GAS INFORMATION (UNAUDITED) (Schedule of Estimated Quantities of Oil and Natural Gas Reserves) (Details) bbl in Millions, ft³ in Billions	12 Months Ended
	Dec. 31, 2016 Boe $ / bbl $ / Mcf bbl ft³	Dec. 31, 2015 Boe $ / bbl $ / Mcf bbl ft³	Dec. 31, 2014 bbl ft³
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Balance at beginning of year (Energy) | Boe	252,000,000	390,000,000
Extensions and discoveries (Energy) | Boe	0	17,000,000
Acquisitions of reserves in-place (Energy) | Boe	0	0
Revisions of previous estimates (Energy) | Boe	1,000,000	(102,000,000)
Sales of reserves in-place (Energy) | Boe	187,000,000	0
Production (Energy) | Boe	48,000,000	53,000,000
Balance at end of year (Energy) | Boe	18,000,000	252,000,000
Proved developed reserves (Energy) | Boe	18,000,000	169,000,000
Proved undeveloped reserves (Energy) | Boe	0	83,000,000
Gulf of Mexico [Member]
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Extensions and discoveries (Energy) | Boe		14,000,000
Haynesville
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Extensions and discoveries (Energy) | Boe		3,000,000
Deepwater Gulf of Mexico, Onshore California and Haynesville Oil And Gas Properties [Member]
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Sales of reserves in-place (Energy) | Boe	187
Natural Gas Liquids [Member]
Proved reserves:
Balance at beginning of year	1	9
Balance at end of year	1	9
Proved developed reserves		6
Proved undeveloped reserves		3
Oil [Member]
Proved reserves:
Balance at beginning of year	4	207	288
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions	0	11
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place	0	0
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates	1	(54)
Sale of reserves in-place	(168)	0
Production	(36)	(38)
Balance at end of year	4	207	288
Proved developed reserves	4	129
Proved undeveloped reserves	0	78
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Realized Sales Prices Used in Reserve Reports | $ / bbl	34.26	47.80
Natural Gas [Member]
Proved reserves:
Balance at beginning of year | ft³	87	274	610
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions | ft³	0	43
Proved Developed and Undeveloped Reserves, Purchases of Minerals in Place | ft³	0	0
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates | ft³	0	(287)
Sale of reserves in-place | ft³	(118)	(2)
Production | ft³	(69)	(90)
Balance at end of year | ft³	87	274	610
Proved developed reserves | ft³	87	245
Proved undeveloped reserves | ft³	0	29
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Realized Sales Prices Used in Reserve Reports | $ / Mcf	2.40	2.55