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Fair Value Measurement (Fair Value Measurement Inputs) (Details) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) $ / bbl | Nov. 16, 2016 USD ($) $ / lb
--- | --- | --- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other current assets |  |  |  | $ 381 | $ 270 |  |  |
Other assets |  |  |  | 2,391 | 2,270 |  |  |
Assets |  |  |  | 37,028 | 37,302 | $ 37,043 |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  | 81 | 33 |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 23 | 166 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 81 | 32 |  |  |
Level 1 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure |  |  |  | 5 | 5 |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 4 | 11 |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 3 | 9 |  |  |
Contingent receivable |  |  |  | 0 | 0 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 7 | 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 |  |  |  | 120 | 123 |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 171 | 266 |  |  |
Contingent receivable |  |  |  | 0 | 0 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 74 | 32 |  |  |
Long-term debt, including current portion |  |  |  | 10,662 | 13,269 |  |  |
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 |  |  |
Contingent receivable |  |  |  | 132 | 134 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 0 | 0 |  |  |
Long-term debt, including current portion |  |  |  | 0 | 0 |  |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure |  |  |  | 29 | 30 |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 178 | 189 |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 174 | 275 |  |  |
Contingent receivable |  |  |  | 132 | 134 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 81 | 33 |  |  |
Long-term debt, including current portion |  |  |  | 10,662 | 13,269 |  |  |
Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Investments, Fair Value Disclosure |  |  |  | 29 | 30 |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 178 | 189 |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 174 | 275 |  |  |
Contingent receivable |  |  |  | 150 | 150 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 81 | 33 |  |  |
Long-term debt, including current portion |  |  |  | 11,127 | 13,117 |  |  |
Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  | 73 | 31 |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 17 | 155 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 73 | 31 |  |  |
Embedded Derivative Financial Instruments [Member] | Level 1 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 0 | 0 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 0 | 0 |  |  |
Embedded Derivative Financial Instruments [Member] | Level 2 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 17 | 155 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 73 | 31 |  |  |
Embedded Derivative Financial Instruments [Member] | Level 3 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 0 | 0 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 0 | 0 |  |  |
Embedded Derivative Financial Instruments [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 17 | 155 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 73 | 31 |  |  |
Embedded Derivative Financial Instruments [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 17 | 155 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 73 | 31 |  |  |
Forward Contracts [Member] | Level 1 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 3 | 0 |  |  |
Forward Contracts [Member] | Level 2 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 3 | 1 |  |  |
Forward Contracts [Member] | Level 3 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 0 | 0 |  |  |
Forward Contracts [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 6 | 1 |  |  |
Forward Contracts [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 6 | 1 |  |  |
Commodity Contract [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  | 8 | 2 |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 6 | 11 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 8 | 1 |  |  |
Commodity Contract [Member] | Level 1 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  |  | 9 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 7 |  |  |  |
Commodity Contract [Member] | Level 2 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  |  | 2 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 1 |  |  |  |
Commodity Contract [Member] | Level 3 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  |  | 0 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 0 |  |  |  |
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  |  | 11 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 8 |  |  |  |
Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  |  | 11 |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  | 8 |  |  |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Level 1 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 0 | 0 |  |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Level 2 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 151 | 108 |  |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Level 3 |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 0 | 0 |  |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 151 | 108 |  |  |
Africa and onshore California [Member] | Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Derivative Asset |  |  |  | 151 | 108 |  |  |
U.S. core fixed income fund [Member] | 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 [Member] | 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 [Member] | 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 [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Marketable Securities |  |  |  | 24 | 25 |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 54 | 55 |  |  |
U.S. core fixed income fund [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Marketable Securities |  |  |  | 24 | 25 |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 54 | 55 |  |  |
Equity securities | Level 1 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Marketable Securities |  |  |  | 5 | 5 |  |  |
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 [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Marketable Securities |  |  |  | 5 | 5 |  |  |
Equity securities | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Marketable Securities |  |  |  | 5 | 5 |  |  |
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 |  |  |  | 37 | 40 |  |  |
Government bonds | Level 3 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Government bonds | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 37 | 40 |  |  |
Government bonds | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 37 | 40 |  |  |
Corporate bonds [Member] | Level 1 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Corporate bonds [Member] | Level 2 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 29 | 32 |  |  |
Corporate bonds [Member] | Level 3 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Corporate bonds [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 29 | 32 |  |  |
Corporate bonds [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 29 | 32 |  |  |
Government mortgage-backed securities [Member] | Level 1 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Government mortgage-backed securities [Member] | Level 2 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 31 | 27 |  |  |
Government mortgage-backed securities [Member] | Level 3 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 31 | 27 |  |  |
Government mortgage-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 31 | 27 |  |  |
Asset-backed securities [Member] | Level 1 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Asset-backed securities [Member] | Level 2 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 14 | 15 |  |  |
Asset-backed securities [Member] | Level 3 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 14 | 15 |  |  |
Asset-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 14 | 15 |  |  |
Money market funds [Member] | Level 1 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 4 | 11 |  |  |
Money market funds [Member] | Level 2 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Money market funds [Member] | Level 3 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Money market funds [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 4 | 11 |  |  |
Money market funds [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 4 | 11 |  |  |
Collateralized Mortgage Backed Securities [Member] | Level 1 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Collateralized Mortgage Backed Securities [Member] | Level 2 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 8 | 8 |  |  |
Collateralized Mortgage Backed Securities [Member] | Level 3 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Collateralized Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 8 | 8 |  |  |
Collateralized Mortgage Backed Securities [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 8 | 8 |  |  |
Municipal bonds [Member] | Level 1 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Municipal bonds [Member] | Level 2 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 1 | 1 |  |  |
Municipal bonds [Member] | Level 3 |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 0 | 0 |  |  |
Municipal bonds [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 1 | 1 |  |  |
Municipal bonds [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Trust Assets Fair Value Disclosure |  |  |  | 1 | 1 |  |  |
Bank Time Deposits [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other current assets |  |  |  | 120 | 52 |  |  |
Other assets |  |  |  | 126 | 123 |  |  |
Commodity Contract [Member] | Level 1 |  |  |  |  |  |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  | 1 |  |  |
Commodity Contract [Member] | Level 2 |  |  |  |  |  |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  | 1 |  |  |
Commodity Contract [Member] | Level 3 |  |  |  |  |  |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  | 0 |  |  |
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  | 2 |  |  |
Commodity Contract [Member] | Carrying Amount, Fair Value Disclosure [Member] |  |  |  |  |  |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Derivative Liability |  |  |  |  | 2 |  |  |
Investment Securities [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Alternative Investment, Fair Value Disclosure |  |  |  | 24 | 25 |  |  |
Investment Securities [Member] | U.S. core fixed income fund [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
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Restricted Funds [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Alternative Investment, Fair Value Disclosure |  |  |  | 54 | 55 |  |  |
Restricted Funds [Member] | U.S. core fixed income fund [Member] |  |  |  |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |  |  |  |
Alternative Investment, Fair Value Disclosure |  |  |  | 54 | 55 |  |  |
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  | 73 | 31 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |
Derivatives: [Abstract] |  |  |  |  |  |  |  |
Long-term debt, including current portion |  |  |  | 150 | 112 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  | 31 | 24 |  |  |
TF Holdings Limited | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other assets |  |  |  | 61 | 74 |  |  |
Derivatives: |  |  |  |  |  |  |  |
Contingent receivable |  |  |  |  |  |  |  | $ 120
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Derivatives: |  |  |  |  |  |  |  |
Contingent receivable |  |  |  |  |  |  |  | 60
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Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  | 31 | 24 |  |  |
Cobalt | TF Holdings Limited | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Contingent receivable |  |  |  |  |  |  |  | $ 60
Contingent consideration, reference threshold (in us dollars per pound) | $ / lb |  |  |  |  |  |  |  | 20
Freeport-McMoRan Oil & Gas | Onshore California [Member] |  |  |  |  |  |  |  |
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Other current assets |  |  |  | 44 |  |  |  |
Other assets |  |  |  |  | 34 |  |  |
Assets |  |  |  | 90 |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Contingent receivable |  |  |  |  |  |  | $ 150 |
Freeport-McMoRan Oil & Gas | Deepwater Gulf of Mexico Interests [Member] |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Other current assets |  |  |  | 28 | 24 |  |  |
Other assets |  |  |  | $ 122 | $ 126 |  |  |
Derivatives: |  |  |  |  |  |  |  |
Contingent receivable |  |  |  |  |  |  | $ 150 |
Scenario, Forecast [Member] | Freeport-McMoRan Oil & Gas | Onshore California [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Contingent receivable | $ 50 | $ 50 | $ 50 |  |  |  |  |
Crude Oil [Member] | Freeport-McMoRan Oil & Gas | Onshore California [Member] |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Contingent consideration, reference threshold (in us dollars per pound) | $ / bbl |  |  |  |  |  |  | 70 |
Maximum [Member] | Copper | TF Holdings Limited | Discontinued Operations, Disposed of by Sale |  |  |  |  |  |  |  |
Derivatives: |  |  |  |  |  |  |  |
Contingent consideration, reference threshold (in us dollars per pound) | $ / lb |  |  |  |  |  |  |  | 3.50

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