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Fair Value Measurement - Fair Value Measurement Inputs (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investment securities (current and long-term): |  |
Marketable Securities | $ 0 |
Other Assets, Current | 608 | $ 523
Other assets | 1,501 | 1,460
Derivatives: |  |
Derivative Asset | 49 | 73
Derivatives: [Abstract] |  |
Derivative Liability | 542 | 24
Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Investments, Fair Value Disclosure | 26 | 29
Trust Assets Fair Value Disclosure | 56 | 64
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 | 5 | 50
Trust Assets Fair Value Disclosure | 8 | 8
Derivatives: |  |
Derivative Asset | 8 | 10
Discontinued Operation, Contingent Receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 64 | 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 | 122 | 137
Derivatives: |  |
Derivative Asset | 45 | 67
Discontinued Operation, Contingent Receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 482 | 27
Long-term debt, including current portion | 10,601 | 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 | 0
Discontinued Operation, Contingent Receivable | 67 | 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 | 31 | 79
Trust Assets Fair Value Disclosure | 186 | 209
Derivatives: |  |
Derivative Asset | 53 | 77
Discontinued Operation, Contingent Receivable | 67 | 81
Derivatives: [Abstract] |  |
Derivative Liability | 546 | 28
Long-term debt, including current portion | 10,601 | 10,630
Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Investments, Fair Value Disclosure | 31 | 79
Trust Assets Fair Value Disclosure | 186 | 209
Derivatives: |  |
Derivative Asset | 53 | 77
Discontinued Operation, Contingent Receivable | 79 | 90
Derivatives: [Abstract] |  |
Derivative Liability | 546 | 28
Long-term debt, including current portion | 11,092 | 9,450
Embedded Derivative Financial Instruments |  |
Derivatives: |  |
Derivative Asset | 38 | 61
Derivatives: [Abstract] |  |
Derivative Liability | 476 | 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 | 38 | 64
Derivatives: [Abstract] |  |
Derivative Liability | 476 | 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 | 38 | 64
Derivatives: [Abstract] |  |
Derivative Liability | 476 | 27
Embedded Derivative Financial Instruments | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset | 38 | 64
Derivatives: [Abstract] |  |
Derivative Liability | 476 | 27
Forward Contracts | Level 1 |  |
Derivatives: |  |
Derivative Asset | 8 | 1
Forward Contracts | Level 2 |  |
Derivatives: |  |
Derivative Asset | 7 | 0
Forward Contracts | Level 3 |  |
Derivatives: |  |
Derivative Asset | 0 | 0
Forward Contracts | Estimate of Fair Value Measurement |  |
Derivatives: |  |
Derivative Asset | 15 | 1
Forward Contracts | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset | 15 | 1
Commodity Contract |  |
Derivatives: |  |
Derivative Asset | 11 | 12
Derivatives: [Abstract] |  |
Derivative Liability | 66 | 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 | 3 | 1
Commodity Contract | Level 1 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 61 |
Commodity Contract | Level 2 |  |
Derivatives: |  |
Derivative Asset |  | 3
Commodity Contract | Level 2 | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 1 | 0
Commodity Contract | Level 2 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 5 |
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 | 4 | 1
Commodity Contract | Estimate of Fair Value Measurement | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 66 |
Commodity Contract | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset |  | 12
Commodity Contract | Carrying Amount, Fair Value Disclosure | Forward Contracts |  |
Derivatives: [Abstract] |  |
Derivative Liability | 4 | 1
Commodity Contract | Carrying Amount, Fair Value Disclosure | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 66 |
U.S. core fixed income fund | Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Marketable Securities | 26 | 29
Trust Assets Fair Value Disclosure | 56 | 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 | 26 | 29
Trust Assets Fair Value Disclosure | 56 | 64
U.S. core fixed income fund | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Marketable Securities | 26 | 29
Trust Assets Fair Value Disclosure | 56 | 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 | 39 | 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 | 39 | 53
Government bonds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 39 | 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 | 36 | 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 | 36 | 45
Corporate bonds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 36 | 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 | 28 | 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 | 28 | 20
Government mortgage-backed securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 28 | 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 | 16 | 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 | 16 | 18
Asset-backed securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 16 | 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 | 119 | 114
Other assets | 134 | 132
Fair Value, Recurring [Member] | Forward Contracts | Estimate of Fair Value Measurement |  |
Derivatives: |  |
Derivative Asset | $ 0 | $ 0

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