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Fair Value of Financial Instruments - Assets and Liabilities Measured and Recorded at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in securities (classified within other current and non-current assets) | $ 19 | $ 19
Other trust fund investments (classified within other non-current assets): |  |
U.S. government and federal agency obligations |  | 1
Measured using net asset value practical expedient: |  |
Total assets | 8,280 | 12,858
Derivative liabilities: |  |
Derivative contracts | 5,721 | 8,441
Foreign exchange |  |
Derivative assets: |  |
Derivative contracts | 8 | 18
Derivative liabilities: |  |
Derivative contracts | 6 | 2
Commodity contracts |  |
Derivative assets: |  |
Derivative contracts | 7,301 | 11,976
Derivative liabilities: |  |
Derivative contracts | 5,600 | 8,439
Interest rate contracts |  |
Derivative assets: |  |
Derivative contracts | 24 |
Consumer Financing Program |  |
Derivative liabilities: |  |
Derivative contracts | 115 |
Cash and cash equivalents |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 21 | 15
U.S. government and federal agency obligations |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 90 | 86
Federal agency mortgage-backed securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 103 | 101
Commercial mortgage-backed securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 34 | 35
Corporate debt securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 116 | 114
Equity securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 464 | 403
Measured using net asset value practical expedient: |  |
Equity securities | 6 | 6
Foreign government fixed income securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 1 | 1
Equity securities — nuclear trust fund investments (classified within non-current assets - held-for-sale) |  |
Measured using net asset value practical expedient: |  |
Equity securities | 93 | 83
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in securities (classified within other current and non-current assets) | 0 | 0
Other trust fund investments (classified within other non-current assets): |  |
U.S. government and federal agency obligations |  | 1
Measured using net asset value practical expedient: |  |
Total assets | 1,798 | 2,432
Derivative liabilities: |  |
Derivative contracts | 1,072 | 1,244
Level 1 | Foreign exchange |  |
Derivative assets: |  |
Derivative contracts | 0 | 0
Derivative liabilities: |  |
Derivative contracts | 0 | 0
Level 1 | Commodity contracts |  |
Derivative assets: |  |
Derivative contracts | 1,225 | 1,929
Derivative liabilities: |  |
Derivative contracts | 1,072 | 1,244
Level 1 | Interest rate contracts |  |
Derivative assets: |  |
Derivative contracts | 0 |
Level 1 | Consumer Financing Program |  |
Derivative liabilities: |  |
Derivative contracts | 0 |
Level 1 | Cash and cash equivalents |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 21 | 15
Level 1 | U.S. government and federal agency obligations |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 88 | 84
Level 1 | Federal agency mortgage-backed securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 1 | Commercial mortgage-backed securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 1 | Corporate debt securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 1 | Equity securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 464 | 403
Level 1 | Foreign government fixed income securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in securities (classified within other current and non-current assets) | 19 | 19
Other trust fund investments (classified within other non-current assets): |  |
U.S. government and federal agency obligations |  | 0
Measured using net asset value practical expedient: |  |
Total assets | 4,871 | 9,086
Derivative liabilities: |  |
Derivative contracts | 3,927 | 6,451
Level 2 | Foreign exchange |  |
Derivative assets: |  |
Derivative contracts | 8 | 18
Derivative liabilities: |  |
Derivative contracts | 6 | 2
Level 2 | Commodity contracts |  |
Derivative assets: |  |
Derivative contracts | 4,564 | 8,796
Derivative liabilities: |  |
Derivative contracts | 3,921 | 6,449
Level 2 | Interest rate contracts |  |
Derivative assets: |  |
Derivative contracts | 24 |
Level 2 | Consumer Financing Program |  |
Derivative liabilities: |  |
Derivative contracts | 0 |
Level 2 | Cash and cash equivalents |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 2 | U.S. government and federal agency obligations |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 2 | 2
Level 2 | Federal agency mortgage-backed securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 103 | 101
Level 2 | Commercial mortgage-backed securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 34 | 35
Level 2 | Corporate debt securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 116 | 114
Level 2 | Equity securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 2 | Foreign government fixed income securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 1 | 1
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in securities (classified within other current and non-current assets) | 0 | 0
Other trust fund investments (classified within other non-current assets): |  |
U.S. government and federal agency obligations |  | 0
Derivative assets: |  |
Derivative contracts | 1,512 | 1,251
Measured using net asset value practical expedient: |  |
Total assets | 1,512 | 1,251
Derivative liabilities: |  |
Derivative contracts | 722 | 746
Level 3 | Foreign exchange |  |
Derivative assets: |  |
Derivative contracts | 0 | 0
Derivative liabilities: |  |
Derivative contracts | 0 | 0
Level 3 | Commodity contracts |  |
Derivative assets: |  |
Derivative contracts | 1,512 | 1,251
Derivative liabilities: |  |
Derivative contracts | 607 | 746
Level 3 | Interest rate contracts |  |
Derivative assets: |  |
Derivative contracts | 0 |
Level 3 | Consumer Financing Program |  |
Derivative liabilities: |  |
Derivative contracts | 115 |
Level 3 | Cash and cash equivalents |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 3 | U.S. government and federal agency obligations |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Federal agency mortgage-backed securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Commercial mortgage-backed securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Corporate debt securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Equity securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Foreign government fixed income securities |  |
Nuclear trust fund investments (classified within non-current assets - held-for-sale): |  |
Nuclear trust fund investments | $ 0 | $ 0

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- Definition Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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