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Acquisitions and Dispositions - Narrative (Details) a in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Feb. 28, 2022 USD ($) | Dec. 31, 2021 USD ($) a | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2022 USD ($)
Subsidiaries Holding Indonesia Assets and Operations |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Earnings before income tax |  |  |  |  |  |  | $ 138,000,000 | $ 264,000,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Canada and Lower 48 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contingent payment |  |  |  |  | $ 174,000,000 | $ 68,000,000 | $ 424,000,000 | $ 94,000,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Subsidiaries Holding Indonesia Assets and Operations |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Disposal group, consideration |  | $ 731,000,000 |  |  |  |  |  |  |
Before-tax gain (loss) on disposition |  | 534,000,000 |  |  |  |  |  |  |
After-tax gain (loss) on disposition |  | 462,000,000 |  |  |  |  |  |  |
Net carry value of asset disposed |  | 200,000,000 |  |  |  |  |  |  |
Assets held for sale, property, plant and equipment |  | 300,000,000 |  |  |  |  |  |  |
Asset held for sale, cash and cash equivalents |  | 200,000,000 |  |  |  |  |  |  |
Asset held for sale, asset retirement obligation |  | $ 100,000,000 |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Certain Noncore Assets |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Disposal group, consideration | $ 370,000,000 |  |  |  |  |  |  |  |
Before-tax gain (loss) on disposition | 80,000,000 |  |  |  |  |  |  |  |
After-tax gain (loss) on disposition | 63,000,000 |  |  |  |  |  |  |  |
Net carry value of asset disposed | 290,000,000 |  |  |  |  |  |  |  |
Assets held for sale, property, plant and equipment | 401,000,000 |  |  |  |  |  |  |  |
Assets held for sale, liabilities | $ 111,000,000 |  |  |  |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Certain Noncore Assets | Forecast | Subsequent Event |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Disposal group, consideration |  |  |  |  |  |  |  |  | $ 265,000,000
APLNG |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Additional ownership percentage in equity investment acquired |  |  | 10.00% |  |  |  |  |  |
Payments to acquire equity method investments |  |  | $ 1,400,000,000 |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 47.50% |  | 47.50% |  | 47.50% |  |
APLNG | Origin Energy |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 27.50% |  |  |  |  |  |
APLNG | Sinopec |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 25.00% |  |  |  |  |  |
Indonesia Corridor Block Production Sharing Contract | Subsidiaries Holding Indonesia Assets and Operations |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  | 54.00% |  |  |  |  |  |  |
Transasia Pipeline Company | Subsidiaries Holding Indonesia Assets and Operations |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  | 35.00% |  |  |  |  |  |  |
Shell Enterprises LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total asset consideration |  |  |  | $ 8,600,000,000 |  |  |  |  |
Area of land | a |  |  |  | 225 |  |  |  |  |
Capitalized costs, proved properties |  |  |  | $ 4,200,000,000 |  |  |  |  |
Capitalized costs, unproved properties |  |  |  | $ 4,300,000,000 |  |  |  |  |

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