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Summary of Significant Accounting Policies - Schedule of Effects of Accounting Changes on Statement of Operations and Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Consolidated Statement of Operations |  |  |
Direct operating expenses | $ 478 | $ 533 | $ 517
Depreciation and amortization | 268 | 278 | 263
Income tax expense (benefit) | (95) | 129 | 79
Net income (loss) | (320) | 362 | 366
Less: Net income (loss) attributable to noncontrolling interest | (64) | (18) | 107
Net (loss) income attributable to CVR Energy stockholders | (256) | 380 | 259
Consolidated Statement of Cash Flows |  |  |
Net cash provided by operating activities | 90 | 747 | 628
Net cash used by investing activities | $ (423) | $ (121) | (108)
As Previously Reported |  |  |
Consolidated Statement of Operations |  |  |
Direct operating expenses |  |  | 523
Depreciation and amortization |  |  | 202
Income tax expense (benefit) |  |  | 89
Net income (loss) |  |  | 411
Less: Net income (loss) attributable to noncontrolling interest |  |  | 122
Net (loss) income attributable to CVR Energy stockholders |  |  | 289
Consolidated Statement of Cash Flows |  |  |
Net cash provided by operating activities |  |  | 620
Net cash used by investing activities |  |  | (100)
Adjustment | Effect of Turnaround Accounting Change |  |  |
Consolidated Statement of Operations |  |  |
Direct operating expenses |  |  | (6)
Depreciation and amortization |  |  | 61
Income tax expense (benefit) |  |  | (10)
Net income (loss) |  |  | (45)
Less: Net income (loss) attributable to noncontrolling interest |  |  | (15)
Net (loss) income attributable to CVR Energy stockholders |  |  | (30)
Consolidated Statement of Cash Flows |  |  |
Net cash provided by operating activities |  |  | 8
Net cash used by investing activities |  |  | $ (8)

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