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Fair Value Measurement - Fair Value Measurement Inputs (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Investment securities (current and long-term): |  |
Marketable Securities | $ 0 |
Other Assets, Current | 472 | $ 492
Other assets | 1,764 | 1,601
Derivatives: |  |
Derivative Asset | 28 | 170
Derivatives: [Abstract] |  |
Derivative Liability | 101 | 42
Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Investments, Fair Value Disclosure | 26 | 25
Trust Assets Fair Value Disclosure | 63 | 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 | 17 | 3
Derivatives: |  |
Derivative Asset |  | 4
Discontinued Operation, Contingent Receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 8 | 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 | 125 | 122
Derivatives: |  |
Derivative Asset |  | 166
Discontinued Operation, Contingent Receivable | 0 | 0
Derivatives: [Abstract] |  |
Derivative Liability | 102 | 42
Long-term debt, including current portion | 9,129 | 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 | 51 | 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 | 31 | 32
Trust Assets Fair Value Disclosure | 205 | 181
Derivatives: |  |
Derivative Asset |  | 170
Discontinued Operation, Contingent Receivable | 51 | 57
Derivatives: [Abstract] |  |
Derivative Liability | 110 | 42
Long-term debt, including current portion | 9,129 | 10,097
Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Investments, Fair Value Disclosure | 31 | 32
Trust Assets Fair Value Disclosure | 205 | 181
Derivatives: |  |
Derivative Asset |  | 170
Discontinued Operation, Contingent Receivable | 59 | 67
Derivatives: [Abstract] |  |
Derivative Liability | 110 | 42
Long-term debt, including current portion | 9,495 | 10,620
Embedded Derivative Financial Instruments |  |
Derivatives: |  |
Derivative Asset | 28 | 166
Derivatives: [Abstract] |  |
Derivative Liability | 90 | 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 | 37 | 166
Derivatives: [Abstract] |  |
Derivative Liability | 100 | 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 | 37 | 166
Derivatives: [Abstract] |  |
Derivative Liability | 100 | 39
Embedded Derivative Financial Instruments | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset | 37 | 166
Derivatives: [Abstract] |  |
Derivative Liability | 100 | 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 | 11 | 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 | 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 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 8 |
Commodity Contract | Level 2 |  |
Derivatives: |  |
Derivative Asset |  | 0
Derivatives: [Abstract] |  |
Derivative Liability |  | 3
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 | 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 | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 10 |
Commodity Contract | Carrying Amount, Fair Value Disclosure |  |
Derivatives: |  |
Derivative Asset |  | 3
Derivatives: [Abstract] |  |
Derivative Liability |  | 3
Commodity Contract | Carrying Amount, Fair Value Disclosure | Futures and Swaps |  |
Derivatives: [Abstract] |  |
Derivative Liability | 10 |
U.S. core fixed income fund | Fair Value Measured at Net Asset Value Per Share |  |
Investment securities (current and long-term): |  |
Marketable Securities | 26 | 25
Trust Assets Fair Value Disclosure | 63 | 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 | 26 | 25
Trust Assets Fair Value Disclosure | 63 | 56
U.S. core fixed income fund | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Marketable Securities | 26 | 25
Trust Assets Fair Value Disclosure | 63 | 56
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 | 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 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 | 33 | 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 | 33 | 34
Government bonds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 33 | 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 | 31 | 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 | 31 | 31
Corporate bonds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 31 | 31
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 | 40 | 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 | 40 | 37
Government mortgage-backed securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 40 | 37
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 | 19 | 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 | 19 | 17
Asset-backed securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 19 | 17
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 | 17 | 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 | 17 | 3
Money market funds | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 17 | 3
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 | 2 | 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 | 2 | 3
Collateralized Mortgage Backed Securities | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Trust Assets Fair Value Disclosure | 2 | 3
Bank Time Deposits | Carrying Amount, Fair Value Disclosure |  |
Investment securities (current and long-term): |  |
Other Assets, Current | 119 | 118
Other assets | $ 134 | 133
Fair Value, Recurring [Member] | Forward Contracts | Estimate of Fair Value Measurement |  |
Derivatives: |  |
Derivative Asset |  | $ 0

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
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