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Fair Value Measurement - Fair Value Measurement Inputs (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2016
Investment securities (current and long-term): |  |  |
Other assets | $ 1,848 | $ 1,810 |
Other Assets, Current | 436 | 375 |
Derivatives: |  |  |
Derivative Asset | 132 | 80 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 31 | 24 |
Restricted cash and cash equivalents | 1,117 | 1,208 |
Designated For Export Proceeds |  |  |
Derivatives: [Abstract] |  |  |
Restricted cash and cash equivalents | 1,000 | 1,100 |
Deepwater Gulf of Mexico Interests | Freeport-McMoRan Oil & Gas |  |  |
Derivatives: |  |  |
Discontinued Operation, Contingent Receivable | 4 |  | $ 150
Derivatives: [Abstract] |  |  |
Royalty interest payable | 1 | 12 |
Net impairment | 32 |  |
Contingent consideration impairment loss | 42 |  |
Decrease to royalty interest payable | 10 |  |
Fair Value Measured at Net Asset Value Per Share |  |  |
Investment securities (current and long-term): |  |  |
Investments, Fair Value Disclosure | 28 | 27 |
Trust Assets Fair Value Disclosure | 68 | 65 |
Derivatives: |  |  |
Derivative Asset | 0 | 0 |
Discontinued Operation, Contingent Receivable | 0 | 0 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 0 | 0 |
Long-term debt, including current portion | 0 | 0 |
Level 1 |  |  |
Investment securities (current and long-term): |  |  |
Investments, Fair Value Disclosure | 9 | 6 |
Trust Assets Fair Value Disclosure | 21 | 17 |
Derivatives: |  |  |
Derivative Asset | 16 | 3 |
Discontinued Operation, Contingent Receivable | 0 | 0 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 14 | 1 |
Long-term debt, including current portion | 0 | 0 |
Level 2 |  |  |
Investment securities (current and long-term): |  |  |
Investments, Fair Value Disclosure | 0 | 0 |
Trust Assets Fair Value Disclosure | 133 | 130 |
Derivatives: |  |  |
Derivative Asset | 119 | 77 |
Discontinued Operation, Contingent Receivable | 0 | 0 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 20 | 23 |
Long-term debt, including current portion | 9,877 | 9,364 |
Level 3 |  |  |
Investment securities (current and long-term): |  |  |
Investments, Fair Value Disclosure | 0 | 0 |
Trust Assets Fair Value Disclosure | 0 | 0 |
Derivatives: |  |  |
Derivative Asset | 0 | 0 |
Discontinued Operation, Contingent Receivable | 4 | 42 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 0 | 0 |
Long-term debt, including current portion | 0 | 0 |
Estimate of Fair Value Measurement |  |  |
Investment securities (current and long-term): |  |  |
Investments, Fair Value Disclosure | 37 | 33 |
Trust Assets Fair Value Disclosure | 222 | 212 |
Derivatives: |  |  |
Derivative Asset | 135 | 80 |
Discontinued Operation, Contingent Receivable | 4 | 42 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 34 | 24 |
Long-term debt, including current portion | 9,877 | 9,364 |
Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Investments, Fair Value Disclosure | 37 | 33 |
Trust Assets Fair Value Disclosure | 222 | 212 |
Derivatives: |  |  |
Derivative Asset | 135 | 80 |
Discontinued Operation, Contingent Receivable | 4 | 50 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 34 | 24 |
Long-term debt, including current portion | 9,679 | 9,422 |
Embedded Derivative Financial Instruments |  |  |
Derivatives: |  |  |
Derivative Asset | 105 | 76 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 8 | 23 |
Embedded Derivative Financial Instruments | Fair Value Measured at Net Asset Value Per Share |  |  |
Derivatives: |  |  |
Derivative Asset | 0 | 0 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 0 | 0 |
Embedded Derivative Financial Instruments | Level 1 |  |  |
Derivatives: |  |  |
Derivative Asset | 0 | 0 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 0 | 0 |
Embedded Derivative Financial Instruments | Level 2 |  |  |
Derivatives: |  |  |
Derivative Asset | 108 | 76 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 11 | 23 |
Embedded Derivative Financial Instruments | Level 3 |  |  |
Derivatives: |  |  |
Derivative Asset | 0 | 0 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 0 | 0 |
Embedded Derivative Financial Instruments | Estimate of Fair Value Measurement |  |  |
Derivatives: |  |  |
Derivative Asset | 108 | 76 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 11 | 23 |
Embedded Derivative Financial Instruments | Carrying Amount, Fair Value Disclosure |  |  |
Derivatives: |  |  |
Derivative Asset | 108 | 76 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 11 | 23 |
Commodity Contract |  |  |
Derivatives: |  |  |
Derivative Asset | 27 | 4 |
Derivatives: [Abstract] |  |  |
Derivative Liability | 23 | 1 |
Commodity Contract | Fair Value Measured at Net Asset Value Per Share | Futures and Swaps |  |  |
Derivatives: |  |  |
Derivative Asset | 0 | 0 |
Commodity Contract | Fair Value Measured at Net Asset Value Per Share | Forward Contracts |  |  |
Derivatives: [Abstract] |  |  |
Derivative Liability | 0 | 0 |
Commodity Contract | Level 1 | Futures and Swaps |  |  |
Derivatives: |  |  |
Derivative Asset | 16 | 3 |
Commodity Contract | Level 1 | Forward Contracts |  |  |
Derivatives: [Abstract] |  |  |
Derivative Liability | 14 | 1 |
Commodity Contract | Level 2 | Futures and Swaps |  |  |
Derivatives: |  |  |
Derivative Asset | 11 | 1 |
Commodity Contract | Level 2 | Forward Contracts |  |  |
Derivatives: [Abstract] |  |  |
Derivative Liability | 9 | 0 |
Commodity Contract | Level 3 | Futures and Swaps |  |  |
Derivatives: |  |  |
Derivative Asset | 0 | 0 |
Commodity Contract | Level 3 | Forward Contracts |  |  |
Derivatives: [Abstract] |  |  |
Derivative Liability | 0 | 0 |
Commodity Contract | Estimate of Fair Value Measurement | Futures and Swaps |  |  |
Derivatives: |  |  |
Derivative Asset | 27 | 4 |
Commodity Contract | Estimate of Fair Value Measurement | Forward Contracts |  |  |
Derivatives: [Abstract] |  |  |
Derivative Liability | 23 | 1 |
Commodity Contract | Carrying Amount, Fair Value Disclosure | Futures and Swaps |  |  |
Derivatives: |  |  |
Derivative Asset | 27 | 4 |
Commodity Contract | Carrying Amount, Fair Value Disclosure | Forward Contracts |  |  |
Derivatives: [Abstract] |  |  |
Derivative Liability | 23 | 1 |
U.S. core fixed income fund | Fair Value Measured at Net Asset Value Per Share |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 28 | 27 |
Trust Assets Fair Value Disclosure | 68 | 65 |
U.S. core fixed income fund | Level 1 |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 0 | 0 |
Trust Assets Fair Value Disclosure | 0 | 0 |
U.S. core fixed income fund | Level 2 |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 0 | 0 |
Trust Assets Fair Value Disclosure | 0 | 0 |
U.S. core fixed income fund | Level 3 |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 0 | 0 |
Trust Assets Fair Value Disclosure | 0 | 0 |
U.S. core fixed income fund | Estimate of Fair Value Measurement |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 28 | 27 |
Trust Assets Fair Value Disclosure | 68 | 65 |
U.S. core fixed income fund | Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 28 | 27 |
Trust Assets Fair Value Disclosure | 68 | 65 |
Equity securities | Fair Value Measured at Net Asset Value Per Share |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 0 | 0 |
Equity securities | Level 1 |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 9 | 6 |
Equity securities | Level 2 |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 0 | 0 |
Equity securities | Level 3 |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 0 | 0 |
Equity securities | Estimate of Fair Value Measurement |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 9 | 6 |
Equity securities | Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Marketable Securities | 9 | 6 |
Government mortgage-backed securities | Fair Value Measured at Net Asset Value Per Share |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Government mortgage-backed securities | Level 1 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Government mortgage-backed securities | Level 2 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 52 | 51 |
Government mortgage-backed securities | Level 3 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Government mortgage-backed securities | Estimate of Fair Value Measurement |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 52 | 51 |
Government mortgage-backed securities | Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 52 | 51 |
Corporate bonds | Fair Value Measured at Net Asset Value Per Share |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Corporate bonds | Level 1 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Corporate bonds | Level 2 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 36 | 29 |
Corporate bonds | Level 3 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Corporate bonds | Estimate of Fair Value Measurement |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 36 | 29 |
Corporate bonds | Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 36 | 29 |
Government bonds | Fair Value Measured at Net Asset Value Per Share |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Government bonds | Level 1 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Government bonds | Level 2 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 30 | 37 |
Government bonds | Level 3 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Government bonds | Estimate of Fair Value Measurement |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 30 | 37 |
Government bonds | Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 30 | 37 |
Money market funds | Fair Value Measured at Net Asset Value Per Share |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Money market funds | Level 1 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 21 | 17 |
Money market funds | Level 2 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Money market funds | Level 3 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Money market funds | Estimate of Fair Value Measurement |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 21 | 17 |
Money market funds | Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 21 | 17 |
Asset-backed securities | Fair Value Measured at Net Asset Value Per Share |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Asset-backed securities | Level 1 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Asset-backed securities | Level 2 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 14 | 12 |
Asset-backed securities | Level 3 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Asset-backed securities | Estimate of Fair Value Measurement |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 14 | 12 |
Asset-backed securities | Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 14 | 12 |
Collateralized Mortgage Backed Securities | Fair Value Measured at Net Asset Value Per Share |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Collateralized Mortgage Backed Securities | Level 1 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Collateralized Mortgage Backed Securities | Level 2 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 1 | 1 |
Collateralized Mortgage Backed Securities | Level 3 |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 0 | 0 |
Collateralized Mortgage Backed Securities | Estimate of Fair Value Measurement |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 1 | 1 |
Collateralized Mortgage Backed Securities | Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Trust Assets Fair Value Disclosure | 1 | 1 |
Bank Time Deposits | Carrying Amount, Fair Value Disclosure |  |  |
Investment securities (current and long-term): |  |  |
Other assets | 100 | 100 |
Other Assets, Current | $ 100 | $ 100 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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