----

|                                                                                                    |
|----------------------------------------------------------------------------------------------------|
|                                                                                                    |  |  |  |  |  |  |  |  |  |  |  |
|                                                                                               | As Reported |   | Pro Forma Adjustments |   | As Adjusted |
| ASSETS                                                                                             |   |   |   |   |   |
| Current Assets                                                                                     |   |   |   |   |   |
| Cash and Cash Equivalents                                                                          | $ | 702 |  |   | $ | 117 |  | (a) | $ | 819 |  |
| Accounts Receivable, Net                                                                           | 824 |  |   | — |  |   | 824 |  |
| Other Current Assets                                                                               | 368 |  |   | — |  |   | 368 |  |
| Assets Held for Sale                                                                               | 324 |  |   | (234 | ) | (b) | 90 |  |
| Total Current Assets                                                                               | 2,218 |  |   | (117 | ) |   | 2,101 |  |
| Property, Plant and Equipment                                                                      |   |  |   |   |   |   |  |
| Oil and Gas Properties (Successful Efforts Method of Accounting)                                   | 18,440 |  |   | — |  |   | 18,440 |  |
| Property, Plant and Equipment, Other                                                               | 322 |  |   | — |  |   | 322 |  |
| Total Property, Plant and Equipment, Gross                                                         | 18,762 |  |   | — |  |   | 18,762 |  |
| Accumulated Depreciation, Depletion and Amortization                                               | (5,337 | ) |   | — |  |   | (5,337 | ) |
| Total Property, Plant and Equipment, Net                                                           | 13,425 |  |   | — |  |   | 13,425 |  |
| Goodwill                                                                                           | 696 |  |   | — |  |   | 696 |  |
| Other Noncurrent Assets                                                                            | 642 |  |   | — |  |   | 642 |  |
| Total Assets                                                                                       | $ | 16,981 |  |   | $ | (117 | ) |   | $ | 16,864 |  |
| LIABILITIES AND SHAREHOLDERS’ EQUITY                                                         |   |   |   |   |   |
| Current Liabilities                                                                                |   |  |   |   |   |   |  |
| Accounts Payable - Trade                                                                           | $ | 1,279 |  |   | $ | — |  |   | $ | 1,279 |  |
| Other Current Liabilities                                                                          | 1,060 |  |   | $ | (157 | ) | (b) | 903 |  |
| Total Current Liabilities                                                                          | 2,339 |  |   | (157 | ) |   | 2,182 |  |
| Long-Term Debt                                                                                     | 4,074 |  |   | — |  |   | 4,074 |  |
| Deferred Income Taxes, Noncurrent                                                                  | 2,080 |  |   | — |  |   | 2,080 |  |
| Other Noncurrent Liabilities                                                                       | 683 |  |   | — |  |   | 683 |  |
| Total Liabilities                                                                                  | 9,176 |  |   | (157 | ) |   | 9,019 |  |
| Commitments and Contingencies                                                                      |   |   |   |   |   |
| Shareholders’ Equity                                                                         |   |  |   |   |   |   |  |
| Preferred Stock - Par Value $1.00 per share; 4 Million Shares Authorized, None Issued              | — |  |   | — |  |   | — |  |
| Common Stock - Par Value $0.01 per share; 500 Million Shares Authorized; 198 Million Shares Issued | 2 |  |   | — |  |   | 2 |  |
| Additional Paid in Capital                                                                         | 3,224 |  |   | — |  |   | 3,224 |  |
| Accumulated Other Comprehensive Loss                                                               | (97 | ) |   | — |  |   | (97 | ) |
| Treasury Stock, at Cost; 19 Million Shares                                                         | (651 | ) |   | — |  |   | (651 | ) |
| Retained Earnings                                                                                  | 5,327 |  |   | 40 |  | (b) | 5,367 |  |
| Total Shareholders’ Equity                                                                   | 7,805 |  |   | 40 |  |   | 7,845 |  |
| Total Liabilities and Shareholders’ Equity                                                   | $ | 16,981 |  |   | $ | (117 | ) |   | $ | 16,864 |  |

----

|                                                        |
|--------------------------------------------------------|
|                                                        |  |  |  |  |  |  |  |  |  |  |  |  |
|                                                   |   | As Reported |   | Pro Forma Adjustments (c) |   | As Adjusted |
| Revenues                                               |   |   |   |   |   |   |
| Oil, Gas and NGL Sales                                 |   | $ | 3,536 |  |   | $ | (257 | ) |   | $ | 3,279 |  |
| Income from Equity Method Investees                    |   | 195 |  |   | — |  |   | 195 |  |
| Other Revenues                                         |   | 32 |  |   | — |  |   | 32 |  |
| Total                                                  |   | 3,763 |  |   | (257 | ) |   | 3,506 |  |
| Costs and Expenses                                     |   |   |   |   |   |   |
| Production Expense                                     |   | 618 |  |   | (38 | ) |   | 580 |  |
| Exploration Expense                                    |   | 279 |  |   | — |  |   | 279 |  |
| Depreciation, Depletion and Amortization               |   | 965 |  |   | (74 | ) |   | 891 |  |
| General and Administrative                             |   | 341 |  |   | — |  |   | 341 |  |
| Gain on Divestitures                                   |   | (25 | ) |   | — |  |   | (25 | ) |
| Asset Impairments                                      |   | 759 |  |   | — |  |   | 759 |  |
| Other Operating (Income) Expense, Net                  |   | 86 |  |   | — |  |   | 86 |  |
| Total                                                  |   | 3,023 |  |   | (112 | ) |   | 2,911 |  |
| Operating Income                                       |   | 740 |  |   | (145 | ) |   | 595 |  |
| Other (Income) Expense                                 |   |   |   |   |   |   |
| (Gain) Loss on Commodity Derivative Instruments        |   | (42 | ) |   | — |  |   | (42 | ) |
| Interest, Net of Amount Capitalized                    |   | 65 |  |   | — |  |   | 65 |  |
| Other Non-Operating (Income) Expense, Net              |   | 2 |  |   | — |  |   | 2 |  |
| Total                                                  |   | 25 |  |   | — |  |   | 25 |  |
| Income from Continuing Operations Before Income Taxes  |   | 715 |  |   | (145 | ) |   | 570 |  |
| Income Tax Provision                                   |   | 262 |  |   | (124 | ) |   | 138 |  |
| Income from Continuing Operations                      |   | $ | 453 |  |   | $ | (21 | ) |   | $ | 432 |  |
|                                                   |   |   |   |   |   |   |
| Earnings from Continuing Operations Per Share, Basic   |   | $ | 2.57 |  |   |   |   | $ | 2.45 |  |
| Earnings from Continuing Operations Per Share, Diluted |   | 2.54 |  |   |   |   | 2.42 |  |
|                                                   |   |   |   |   |   |   |
| Weighted Average Number of Shares Outstanding          |   |   |   |   |   |   |
|    Basic                                |   | 176 |  |   |   |   | 176 |  |
|    Diluted                              |   | 179 |  |   |   |   | 179 |  |

----

|                                                        |
|--------------------------------------------------------|
|                                                        |  |  |  |  |  |  |  |  |  |  |  |  |
|                                                   |   | As Reported |   | Pro Forma Adjustments (c) |   | As Adjusted |
| Revenues                                               |   |   |   |   |   |   |
| Oil, Gas and NGL Sales                                 |   | $ | 2,832 |  |   | $ | (203 | ) |   | $ | 2,629 |  |
| Income from Equity Method Investees                    |   | 118 |  |   | — |  |   | 118 |  |
| Other Revenues                                         |   | 72 |  |   | — |  |   | 72 |  |
| Total                                                  |   | 3,022 |  |   | (203 | ) |   | 2,819 |  |
| Costs and Expenses                                     |   |   |   |   |   |   |
| Production Expense                                     |   | 570 |  |   | (34 | ) |   | 536 |  |
| Exploration Expense                                    |   | 245 |  |   | (1 | ) |   | 244 |  |
| Depreciation, Depletion and Amortization               |   | 883 |  |   | (55 | ) |   | 828 |  |
| General and Administrative                             |   | 277 |  |   | — |  |   | 277 |  |
| Gain on Divestitures                                   |   | (113 | ) |   | — |  |   | (113 | ) |
| Asset Impairments                                      |   | 144 |  |   | — |  |   | 144 |  |
| Other Operating (Income) Expense, Net                  |   | 64 |  |   | — |  |   | 64 |  |
| Total                                                  |   | 2,070 |  |   | (90 | ) |   | 1,980 |  |
| Operating Income                                       |   | 952 |  |   | (113 | ) |   | 839 |  |
| Other (Income) Expense                                 |   |   |   |   |   |   |
| (Gain) Loss on Commodity Derivative Instruments        |   | (157 | ) |   | — |  |   | (157 | ) |
| Interest, Net of Amount Capitalized                    |   | 72 |  |   | — |  |   | 72 |  |
| Other Non-Operating (Income) Expense, Net              |   | 6 |  |   | — |  |   | 6 |  |
| Total                                                  |   | (79 | ) |   | — |  |   | (79 | ) |
| Income from Continuing Operations Before Income Taxes  |   | 1,031 |  |   | (113 | ) |   | 918 |  |
| Income Tax Provision                                   |   | 306 |  |   | (56 | ) |   | 250 |  |
| Income from Continuing Operations                      |   | $ | 725 |  |   | $ | (57 | ) |   | $ | 668 |  |
|                                                   |   |   |   |   |   |   |
| Earnings from Continuing Operations Per Share, Basic   |   | $ | 4.15 |  |   |   |   | $ | 3.82 |  |
| Earnings from Continuing Operations Per Share, Diluted |   | 4.10 |  |   |   |   | 3.77 |  |
|                                                   |   |   |   |   |   |   |
| Weighted Average Number of Shares Outstanding          |   |   |   |   |   |   |
|    Basic                                |   | 175 |  |   |   |   | 175 |  |
|    Diluted                              |   | 177 |  |   |   |   | 177 |  |

----

|                                                     |
|-----------------------------------------------------|
|                                                     |  |  |  |  |  |  |  |  |  |  |  |  |
|                                                |   | As Reported |   | Pro Forma Adjustments (c) |   | As Adjusted |
| Revenues                                            |   |   |   |   |   |   |
| Oil, Gas and NGL Sales                              |   | $ | 2,060 |  |   | $ | (78 | ) |   | $ | 1,982 |  |
| Income from Equity Method Investees                 |   | 84 |  |   | — |  |   | 84 |  |
| Other Revenues                                      |   | 169 |  |   | — |  |   | 169 |  |
| Total                                               |   | 2,313 |  |   | (78 | ) |   | 2,235 |  |
| Costs and Expenses                                  |   |   |   |   |   |   |
| Production Expense                                  |   | 525 |  |   | (25 | ) |   | 500 |  |
| Exploration Expense                                 |   | 144 |  |   | — |  |   | 144 |  |
| Depreciation, Depletion and Amortization            |   | 816 |  |   | (17 | ) |   | 799 |  |
| General and Administrative                          |   | 237 |  |   | — |  |   | 237 |  |
| Gain on Divestitures                                |   | (22 | ) |   | — |  |   | (22 | ) |
| Asset Impairments                                   |   | 604 |  |   | — |  |   | 604 |  |
| Other Operating (Income) Expense, Net               |   | 67 |  |   | — |  |   | 67 |  |
| Total                                               |   | 2,371 |  |   | (42 | ) |   | 2,329 |  |
| Operating Loss                                      |   | (58 | ) |   | (36 | ) |   | (94 | ) |
| Other (Income) Expense                              |   |   |   |   |   |   |
| (Gain) Loss on Commodity Derivative Instruments     |   | 110 |  |   | — |  |   | 110 |  |
| Interest, Net of Amount Capitalized                 |   | 84 |  |   | — |  |   | 84 |  |
| Other Non-Operating (Income) Expense, Net           |   | 12 |  |   | — |  |   | 12 |  |
| Total                                               |   | 206 |  |   | — |  |   | 206 |  |
| Loss from Continuing Operations Before Income Taxes |   | (264 | ) |   | (36 | ) |   | (300 | ) |
| Income Tax Provision                                |   | (133 | ) |   | (18 | ) |   | (151 | ) |
| Loss from Continuing Operations                     |   | $ | (131 | ) |   | $ | (18 | ) |   | $ | (149 | ) |
|                                                |   |   |   |   |   |   |
| Loss from Continuing Operations Per Share, Basic    |   | $ | (0.75 | ) |   |   |   | $ | (0.86 | ) |
| Loss from Continuing Operations Per Share, Diluted  |   | (0.75 | ) |   |   |   | (0.86 | ) |
|                                                |   |   |   |   |   |   |
| Weighted Average Number of Shares Outstanding       |   |   |   |   |   |   |
|    Basic                             |   | 173 |  |   |   |   | 173 |  |
|    Diluted                           |   | 173 |  |   |   |   | 173 |  |

----

|                                                     |
|-----------------------------------------------------|
|                                                     |  |  |  |
| (in millions)                                       |   |
| Gross Proceeds                                      | $ | 129 |  |
| Less:                                               |   |
| Estimated Closing Adjustments and Transaction Costs | (12 | ) |
| Estimated Net Proceeds                              | $ | 117 |  |

|                                                          |
|----------------------------------------------------------|
|                                                          |  |  |  |
| (in millions)                                            |   |
| Estimated Net Proceeds                                   | $ | 117 |  |
| Less:                                                    |   |
| Net Book Value of Assets Sold                            | (234 | ) |
| Asset Retirement Obligations Associated with Assets Sold | 55 |  |
| Pre-tax Loss on Asset Sale                               | (62 | ) |
| Deferred Tax Liability Associated with Assets Sold       | 102 |  |
| Gain on Asset Sale, Net of Tax                           | $ | 40 |  |