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Fair Value Measurement - Fair Value Measurement Inputs (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investment securities (current and long-term): |  |
Other Assets, Current | $ 406 | $ 381
Other assets | 1,709 | 1,601
Derivatives: |  |
Derivative Asset | 13 | 170
Derivatives: [Abstract] |  |
Derivative Liability | 41 | 42
Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Investments, Fair Value Disclosure | 25 | 25
Trust Assets Fair Value Disclosure | 61 | 56
Derivatives: |  |
Derivative Asset |  | 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 | 5 | 7
Trust Assets Fair Value Disclosure | 19 | 3
Derivatives: |  |
Derivative Asset |  | 4
Discontinued Operation, Contingent Receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 7 | 0
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 | 119 | 122
Derivatives: |  |
Derivative Asset |  | 166
Discontinued Operation, Contingent Receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 37 | 42
Long-term debt, including current portion | 8,639 | 10,097
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
Discontinued Operation, Contingent Receivable | 47 | 57
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 | 30 | 32
Trust Assets Fair Value Disclosure | 199 | 181
Derivatives: |  |
Derivative Asset |  | 170
Discontinued Operation, Contingent Receivable | 47 | 57
Derivatives: [Abstract] |  |
Derivative Liability | 44 | 42
Long-term debt, including current portion | 8,639 | 10,097
Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Investments, Fair Value Disclosure | 30 | 32
Trust Assets Fair Value Disclosure | 199 | 181
Derivatives: |  |
Derivative Asset |  | 170
Discontinued Operation, Contingent Receivable | 55 | 67
Derivatives: [Abstract] |  |
Derivative Liability | 44 | 42
Long-term debt, including current portion | 9,405 | 10,620
Embedded Derivative Financial Instruments |  |
Derivatives: |  |
Derivative Asset | 13 | 166
Derivatives: [Abstract] |  |
Derivative Liability | 32 | 39
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 | 16 | 166
Derivatives: [Abstract] |  |
Derivative Liability | 35 | 39
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 | 16 | 166
Derivatives: [Abstract] |  |
Derivative Liability | 35 | 39
Embedded Derivative Financial Instruments | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset | 16 | 166
Derivatives: [Abstract] |  |
Derivative Liability | 35 | 39
Forward Contracts | Level 1 |  |
Derivatives: |  |
Derivative Asset |  | 1
Forward Contracts | Level 2 |  |
Derivatives: |  |
Derivative Asset |  | 0
Forward Contracts | Level 3 |  |
Derivatives: |  |
Derivative Asset |  | 0
Forward Contracts | Estimate of Fair Value Measurement |  |
Derivatives: |  |
Derivative Asset |  | 1
Forward Contracts | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset |  | 1
Commodity Contract |  |
Derivatives: |  |
Derivative Asset | 0 | 4
Derivatives: [Abstract] |  |
Derivative Liability | 9 | 3
Commodity Contract | Fair Value Measured at Net Asset Value Per Share |  |
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 | Fair Value Measured at Net Asset Value Per Share | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 0 |
Commodity Contract | Level 1 |  |
Derivatives: |  |
Derivative Asset |  | 3
Derivatives: [Abstract] |  |
Derivative Liability |  | 0
Commodity Contract | Level 1 | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 1 |
Commodity Contract | Level 1 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 6 |
Commodity Contract | Level 2 |  |
Derivatives: |  |
Derivative Asset |  | 0
Derivatives: [Abstract] |  |
Derivative Liability |  | 3
Commodity Contract | Level 2 | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 0 |
Commodity Contract | Level 2 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 2 |
Commodity Contract | Level 3 |  |
Derivatives: |  |
Derivative Asset |  | 0
Derivatives: [Abstract] |  |
Derivative Liability |  | 0
Commodity Contract | Level 3 | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 0 |
Commodity Contract | Level 3 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 0 |
Commodity Contract | Estimate of Fair Value Measurement |  |
Derivatives: |  |
Derivative Asset |  | 3
Derivatives: [Abstract] |  |
Derivative Liability |  | 3
Commodity Contract | Estimate of Fair Value Measurement | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 1 |
Commodity Contract | Estimate of Fair Value Measurement | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 8 |
Commodity Contract | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset |  | 3
Derivatives: [Abstract] |  |
Derivative Liability |  | 3
Commodity Contract | Carrying Amount, Fair Value Disclosure | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 1 |
Commodity Contract | Carrying Amount, Fair Value Disclosure | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 8 |
U.S. core fixed income fund | Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Marketable Securities | 25 | 25
Trust Assets Fair Value Disclosure | 61 | 56
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 | 25 | 25
Trust Assets Fair Value Disclosure | 61 | 56
U.S. core fixed income fund | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Marketable Securities | 25 | 25
Trust Assets Fair Value Disclosure | 61 | 56
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 | 5 | 7
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 | 5 | 7
Equity securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Marketable Securities | 5 | 7
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 | 43 | 37
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 | 43 | 37
Government mortgage-backed securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 43 | 37
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 | 34
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 | 34
Government bonds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 30 | 34
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 | 30 | 31
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 | 30 | 31
Corporate bonds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 30 | 31
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 | 3
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 | 3
Money market funds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 19 | 3
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 | 15 | 17
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 | 15 | 17
Asset-backed securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 15 | 17
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 | 3
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 | 3
Collateralized Mortgage Backed Securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 1 | 3
Bank Time Deposits | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Other Assets, Current | 111 | 103
Other assets | $ 135 | 133
Fair Value, Recurring [Member] | Forward Contracts | Estimate of Fair Value Measurement |  |
Derivatives: |  |
Derivative Asset |  | $ 0

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