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Fair Value Measurement - Fair Value Measurement Inputs (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investment securities (current and long-term): |  |
Marketable Securities | $ 0 |
Other Assets, Current | 647 | $ 523
Other assets | 1,546 | 1,460
Derivatives: |  |
Derivative Asset | 62 | 73
Derivatives: [Abstract] |  |
Derivative Liability | 266 | 24
Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Investments, Fair Value Disclosure | 25 | 29
Trust Assets Fair Value Disclosure | 55 | 64
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 | 50
Trust Assets Fair Value Disclosure | 8 | 8
Derivatives: |  |
Derivative Asset |  | 10
Discontinued Operation, Contingent Receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 43 | 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 | 115 | 137
Derivatives: |  |
Derivative Asset |  | 67
Discontinued Operation, Contingent Receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 229 | 27
Long-term debt, including current portion | 9,578 | 10,630
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 | 60 | 81
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 | 79
Trust Assets Fair Value Disclosure | 178 | 209
Derivatives: |  |
Derivative Asset |  | 77
Discontinued Operation, Contingent Receivable | 60 | 81
Derivatives: [Abstract] |  |
Derivative Liability | 272 | 28
Long-term debt, including current portion | 9,578 | 10,630
Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Investments, Fair Value Disclosure | 30 | 79
Trust Assets Fair Value Disclosure | 178 | 209
Derivatives: |  |
Derivative Asset |  | 77
Discontinued Operation, Contingent Receivable | 71 | 90
Derivatives: [Abstract] |  |
Derivative Liability | 272 | 28
Long-term debt, including current portion | 10,690 | 9,450
Embedded Derivative Financial Instruments |  |
Derivatives: |  |
Derivative Asset | 62 | 61
Derivatives: [Abstract] |  |
Derivative Liability | 216 | 24
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 | 68 | 64
Derivatives: [Abstract] |  |
Derivative Liability | 222 | 27
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 | 68 | 64
Derivatives: [Abstract] |  |
Derivative Liability | 222 | 27
Embedded Derivative Financial Instruments | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset | 68 | 64
Derivatives: [Abstract] |  |
Derivative Liability | 222 | 27
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 | 12
Derivatives: [Abstract] |  |
Derivative Liability | 50 | 0
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 | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 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 |  | 9
Commodity Contract | Level 1 | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 1
Commodity Contract | Level 1 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 42 |
Commodity Contract | Level 2 |  |
Derivatives: |  |
Derivative Asset |  | 3
Commodity Contract | Level 2 | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Commodity Contract | Level 2 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 7 |
Commodity Contract | Level 3 |  |
Derivatives: |  |
Derivative Asset |  | 0
Commodity Contract | Level 3 | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 0 | 0
Commodity Contract | Level 3 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 0 |
Commodity Contract | Estimate of Fair Value Measurement |  |
Derivatives: |  |
Derivative Asset |  | 12
Commodity Contract | Estimate of Fair Value Measurement | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 1
Commodity Contract | Estimate of Fair Value Measurement | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 49 |
Commodity Contract | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset |  | 12
Commodity Contract | Carrying Amount, Fair Value Disclosure | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 1
Commodity Contract | Carrying Amount, Fair Value Disclosure | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 49 |
U.S. core fixed income fund | Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Marketable Securities | 25 | 29
Trust Assets Fair Value Disclosure | 55 | 64
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 | 29
Trust Assets Fair Value Disclosure | 55 | 64
U.S. core fixed income fund | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Marketable Securities | 25 | 29
Trust Assets Fair Value Disclosure | 55 | 64
Equity securities | Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Marketable Securities |  | 0
Equity securities | Level 1 |  |
Investment securities (current and long-term): |  |
Marketable Securities | 5 | 50
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 | 50
Equity securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Marketable Securities | 5 | 50
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 | 35 | 53
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 | 35 | 53
Government bonds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 35 | 53
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 | 33 | 45
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 | 33 | 45
Corporate bonds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 33 | 45
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 | 27 | 20
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 | 27 | 20
Government mortgage-backed securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 27 | 20
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 | 17 | 18
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 | 17 | 18
Asset-backed securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 17 | 18
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 | 8 | 8
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 | 8 | 8
Money market funds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 8 | 8
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 |
Collateralized Mortgage Backed Securities | Level 1 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 |
Collateralized Mortgage Backed Securities | Level 2 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 3 |
Collateralized Mortgage Backed Securities | Level 3 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 0 |
Collateralized Mortgage Backed Securities | Estimate of Fair Value Measurement |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 3 |
Collateralized Mortgage Backed Securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 3 |
Municipal bonds | Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure |  | 0
Municipal bonds | Level 1 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure |  | 0
Municipal bonds | Level 2 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure |  | 1
Municipal bonds | Level 3 |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure |  | 0
Municipal bonds | Estimate of Fair Value Measurement |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure |  | 1
Municipal bonds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure |  | 1
Bank Time Deposits | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Other Assets, Current | 112 | 114
Other assets | $ 134 | 132
Fair Value, Recurring [Member] | Forward Contracts | Estimate of Fair Value Measurement |  |
Derivatives: |  |
Derivative Asset |  | $ 0

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