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Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Deferred Income Tax Assets (Liabilities) |  |  |  |
Foreign Oil and Gas Exploration and Development Costs Deducted for Tax Under Book Depreciation, Depletion and Amortization |  | $ (19) | $ 25 |
Foreign Asset Retirement Obligations |  | 51 | 0 |
Foreign Accrued Expenses and Liabilities |  | 15 | 0 |
Foreign Net Operating Loss |  | 80 | 74 |
Foreign Valuation Allowances |  | (111) | (97) |
Foreign Other |  | (5) | 0 |
Total Net Deferred Income Tax Assets |  | 11 | 2 |
Deferred Income Tax (Assets) Liabilities |  |  |  |
Oil and Gas Exploration and Development Costs Deducted for Tax Over Book Depreciation, Depletion and Amortization |  | 5,063 | 5,028 |
Commodity Hedging Contracts |  | (97) |  |
Commodity Hedging Contracts |  |  | 15 |
Deferred Compensation Plans |  | (57) | (43) |
Equity Awards |  | (86) | (103) |
Undistributed Foreign Earnings |  | 0 | 10 |
Other |  | (74) | (48) |
Total Net Deferred Income Tax Liabilities |  | 4,749 | 4,859 |
Total Net Deferred Income Tax Liabilities |  | 4,738 | 4,857 |
Components Income (Loss) Before Income Taxes [Abstract] |  |  |  |
United States |  | 5,787 | (756) | $ 3,466
Foreign |  | 146 | 17 | 79
Income (Loss) Before Income Taxes |  | 5,933 | (739) | 3,545
Current income tax provision (benefit) [Abstract] |  |  |  |
Federal |  | 1,203 | (108) | (152)
State |  | 85 | 7 | 10
Foreign |  | 105 | 40 | 81
Total |  | 1,393 | (61) | (61)
Deferred income tax provision (benefit) [Abstract] |  |  |  |
Federal |  | (41) | (153) | 627
State |  | (62) | (15) | 33
Foreign |  | (19) | (18) | (28)
Total |  | (122) | (186) | 632
Other Non-Current (1) |  |  |  |
Federal | [1] | 0 | 113 | 245
Foreign |  | (2) | 0 | (6)
Total |  | (2) | 113 | 239
Income Tax Provision (Benefit) |  | $ 1,269 | $ (134) | $ 810
Federal Statutory and Effective Income Tax Rates [Abstract] |  |  |  |
Statutory Federal Income Tax Rate (in hundredths) |  | 21.00% | 21.00% | 21.00%
State Income Tax, Net of Federal Benefit (in hundredths) |  | 0.30% | 0.90% | 1.00%
Income Tax Provision Related to Foreign Operations (in hundredths) |  | 0.90% | (0.10%) | 0.90%
Income Tax Provision Related to Canadian Operations (in hundredths) |  | 0.00% | (2.40%) | 0.00%
Shared-Based Compensation (in hundredths) |  | 0.20% | (2.90%) | 0.00%
Other (in hundredths) |  | (1.00%) | 1.70% | 0.00%
Effective Income Tax Rate (in hundredths) |  | 21.40% | 18.20% | 22.90%
Components of Valuation Allowance [Abstract] |  |  |  |
Beginning Balance |  | $ 219 | $ 201 | $ 167
Increase | [2] | 15 | 25 | 31
Decrease | [3] | (14) | (11) | 0
Other | [4] | (1) | 4 | 3
Ending Balance |  | 219 | $ 219 | $ 201
Balance of state net operating loss expected to be carried forward |  | 2,000 |  |
Canadian Net Operating Loss Carryforwards |  | 297 |  |
Unrecognized Tax Benefits Balance |  | $ 9 |  |
[1] | Includes changes in certain amounts that are expected to be paid or received beyond the next twelve months. The primary component in 2020 and 2019 is refundable alternative minimum tax (AMT) credits.
[2] | Increase in valuation allowance related to the generation of tax NOLs and other deferred tax assets.
[3] | Decrease in valuation allowance associated with adjustments to certain deferred tax assets and their related allowances.
[4] | Represents dispositions, revisions and/or foreign exchange rate variances and the effect of statutory income tax rate changes.

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