Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Revenues
Oil, NGL and Gas Sales		$ 994	$ 705
Income from Equity Method Investees		42	19
Total		1,036	724
Costs and Expenses
Production Expense		303	276
Exploration Expense		42	163
Depreciation, Depletion and Amortization		528	617
General and Administrative		99	91
Other Operating Expense, Net		29	(1)
Total		1,001	1,146
Operating Income (Loss)		35	(422)
Other Expense (Income)
Gain on Commodity Derivative Instruments		(110)	(44)
Interest, Net of Amount Capitalized		87	79
Other Non-Operating Income, Net		(1)	(4)
Total		(24)	31
Income (Loss) Before Income Taxes		59	(453)
Income Tax Provision (Benefit)		12	(166)
Net Income (Loss) and Comprehensive Income (Loss) Including Noncontrolling Interests		47	(287)
Less: Net Income and Comprehensive Income (Loss) Attributable to Noncontrolling Interests		11	0
Net Income (Loss) and Comprehensive Income (Loss) Including Noncontrolling Interests		$ 36	$ (287)
Loss per share, basic (in dollars per share)		$ 0.08	$ (0.67)
Loss per share, diluted (in dollars per share)		$ 0.08	$ (0.67)
Weighted Average Number of Shares Outstanding
Basic (in shares)	[1]	431	429
Diluted (in shares)	[2]	434	429

[1] {F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjk1YmYwYzc1YTZjMzRiODlhMjM5ZGQxOWU2MGYxYWI5fFRleHRTZWxlY3Rpb246RkI3RUI3MTE2OEVENTI4N0FGQ0IxQUNENjZBNjVDOTAM}

[2] For first quarter 2016, all outstanding options and non-vested restricted shares have been excluded from the calculation of diluted loss per share as the Company incurred a net loss. Therefore, inclusion of outstanding options and non-vested restricted shares in the calculation of diluted loss per share would be anti-dilut