Fair Value Measurement - Fair Value Measurement Inputs (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2016 |
Investment securities (current and long-term): | | | |
Other Assets, Current | $ 389 | $ 375 | |
Other assets | 1,843 | 1,810 | |
Derivatives: | | | |
Derivative Asset | 93 | 80 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 40 | 24 | |
Deepwater Gulf of Mexico Interests | Freeport-McMoRan Oil & Gas | | | |
Derivatives: | | | |
Discontinued Operation, Contingent Receivable | | | $ 150 |
Fair Value Measured at Net Asset Value Per Share | | | |
Investment securities (current and long-term): | | | |
Investments, Fair Value Disclosure | 27 | 27 | |
Trust Assets Fair Value Disclosure | 65 | 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 | 7 | 6 | |
Trust Assets Fair Value Disclosure | 19 | 17 | |
Derivatives: | | | |
Derivative Asset | 13 | 3 | |
Discontinued Operation, Contingent Receivable | 0 | 0 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 2 | 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 | 129 | 130 | |
Derivatives: | | | |
Derivative Asset | 87 | 77 | |
Discontinued Operation, Contingent Receivable | 0 | 0 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 45 | 23 | |
Long-term debt, including current portion | 9,221 | 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 | 39 | 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 | 34 | 33 | |
Trust Assets Fair Value Disclosure | 213 | 212 | |
Derivatives: | | | |
Derivative Asset | 100 | 80 | |
Discontinued Operation, Contingent Receivable | 39 | 42 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 47 | 24 | |
Long-term debt, including current portion | 9,221 | 9,364 | |
Carrying Amount, Fair Value Disclosure | | | |
Investment securities (current and long-term): | | | |
Investments, Fair Value Disclosure | 34 | 33 | |
Trust Assets Fair Value Disclosure | 213 | 212 | |
Derivatives: | | | |
Derivative Asset | 100 | 80 | |
Discontinued Operation, Contingent Receivable | 47 | 50 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 47 | 24 | |
Long-term debt, including current portion | 9,426 | 9,422 | |
Embedded Derivative Financial Instruments | | | |
Derivatives: | | | |
Derivative Asset | 70 | 76 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 36 | 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 | 77 | 76 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 43 | 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 | 77 | 76 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 43 | 23 | |
Embedded Derivative Financial Instruments | Carrying Amount, Fair Value Disclosure | | | |
Derivatives: | | | |
Derivative Asset | 77 | 76 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 43 | 23 | |
Commodity Contract | | | |
Derivatives: | | | |
Derivative Asset | 23 | 4 | |
Derivatives: [Abstract] | | | |
Derivative Liability | 4 | 1 | |
Commodity Contract | Fair Value Measured at Net Asset Value Per Share | | | |
Derivatives: | | | |
Derivative Asset | | 0 | |
Commodity Contract | Fair Value Measured at Net Asset Value Per Share | Futures and Swaps | | | |
Derivatives: | | | |
Derivative Asset | 0 | | |
Derivatives: [Abstract] | | | |
Derivative Liability | 0 | | |
Commodity Contract | Fair Value Measured at Net Asset Value Per Share | Forward Contracts | | | |
Derivatives: [Abstract] | | | |
Derivative Liability | | 0 | |
Commodity Contract | Level 1 | | | |
Derivatives: | | | |
Derivative Asset | | 3 | |
Commodity Contract | Level 1 | Futures and Swaps | | | |
Derivatives: | | | |
Derivative Asset | 11 | | |
Derivatives: [Abstract] | | | |
Derivative Liability | 2 | | |
Commodity Contract | Level 1 | Forward Contracts | | | |
Derivatives: [Abstract] | | | |
Derivative Liability | | 1 | |
Commodity Contract | Level 2 | | | |
Derivatives: | | | |
Derivative Asset | | 1 | |
Commodity Contract | Level 2 | Futures and Swaps | | | |
Derivatives: | | | |
Derivative Asset | 7 | | |
Derivatives: [Abstract] | | | |
Derivative Liability | 2 | | |
Commodity Contract | Level 2 | Forward Contracts | | | |
Derivatives: [Abstract] | | | |
Derivative Liability | | 0 | |
Commodity Contract | Level 3 | | | |
Derivatives: | | | |
Derivative Asset | | 0 | |
Commodity Contract | Level 3 | Futures and Swaps | | | |
Derivatives: | | | |
Derivative Asset | 0 | | |
Derivatives: [Abstract] | | | |
Derivative Liability | 0 | | |
Commodity Contract | Level 3 | Forward Contracts | | | |
Derivatives: [Abstract] | | | |
Derivative Liability | | 0 | |
Commodity Contract | Estimate of Fair Value Measurement | | | |
Derivatives: | | | |
Derivative Asset | | 4 | |
Commodity Contract | Estimate of Fair Value Measurement | Futures and Swaps | | | |
Derivatives: | | | |
Derivative Asset | 18 | | |
Derivatives: [Abstract] | | | |
Derivative Liability | 4 | | |
Commodity Contract | Estimate of Fair Value Measurement | Forward Contracts | | | |
Derivatives: [Abstract] | | | |
Derivative Liability | | 1 | |
Commodity Contract | Carrying Amount, Fair Value Disclosure | | | |
Derivatives: | | | |
Derivative Asset | | 4 | |
Commodity Contract | Carrying Amount, Fair Value Disclosure | Futures and Swaps | | | |
Derivatives: | | | |
Derivative Asset | 18 | | |
Derivatives: [Abstract] | | | |
Derivative Liability | 4 | | |
Commodity Contract | Carrying Amount, Fair Value Disclosure | Forward Contracts | | | |
Derivatives: [Abstract] | | | |
Derivative Liability | | 1 | |
Forward Contracts | Level 1 | | | |
Derivatives: | | | |
Derivative Asset | 2 | | |
Forward Contracts | Level 2 | | | |
Derivatives: | | | |
Derivative Asset | 3 | | |
Forward Contracts | Level 3 | | | |
Derivatives: | | | |
Derivative Asset | 0 | | |
Forward Contracts | Estimate of Fair Value Measurement | | | |
Derivatives: | | | |
Derivative Asset | 5 | | |
Forward Contracts | Carrying Amount, Fair Value Disclosure | | | |
Derivatives: | | | |
Derivative Asset | 5 | | |
U.S. core fixed income fund | Fair Value Measured at Net Asset Value Per Share | | | |
Investment securities (current and long-term): | | | |
Marketable Securities | 27 | 27 | |
Trust Assets Fair Value Disclosure | 65 | 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 | 27 | 27 | |
Trust Assets Fair Value Disclosure | 65 | 65 | |
U.S. core fixed income fund | Carrying Amount, Fair Value Disclosure | | | |
Investment securities (current and long-term): | | | |
Marketable Securities | 27 | 27 | |
Trust Assets Fair Value Disclosure | 65 | 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 | 7 | 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 | 7 | 6 | |
Equity securities | Carrying Amount, Fair Value Disclosure | | | |
Investment securities (current and long-term): | | | |
Marketable Securities | 7 | 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 | 49 | 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 | 49 | 51 | |
Government mortgage-backed securities | Carrying Amount, Fair Value Disclosure | | | |
Investment securities (current and long-term): | | | |
Trust Assets Fair Value Disclosure | 49 | 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 | 35 | 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 | 35 | 29 | |
Corporate bonds | Carrying Amount, Fair Value Disclosure | | | |
Investment securities (current and long-term): | | | |
Trust Assets Fair Value Disclosure | 35 | 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 | 31 | 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 | 31 | 37 | |
Government bonds | Carrying Amount, Fair Value Disclosure | | | |
Investment securities (current and long-term): | | | |
Trust Assets Fair Value Disclosure | 31 | 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 | 19 | 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 | 19 | 17 | |
Money market funds | Carrying Amount, Fair Value Disclosure | | | |
Investment securities (current and long-term): | | | |
Trust Assets Fair Value Disclosure | 19 | 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 | 13 | 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 | 13 | 12 | |
Asset-backed securities | Carrying Amount, Fair Value Disclosure | | | |
Investment securities (current and long-term): | | | |
Trust Assets Fair Value Disclosure | 13 | 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, Current | 100 | 100 | |
Other assets | 100 | $ 100 | |
Fair Value, Recurring [Member] | Forward Contracts | Estimate of Fair Value Measurement | | | |
Derivatives: | | | |
Derivative Asset | $ 0 | | |