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Fair Value of Financial Instruments - Assets and Liabilities Measured and Recorded at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in securities (classified within other current and non-current assets) | $ 17 | $ 32
Other trust fund investments (classified within other non-current assets): |  |
U.S. government and federal agency obligations | 1 | 1
Measured using net asset value practical expedient: |  |
Total assets | 13,624 | 8,188
Derivative liabilities: |  |
Commodity contracts | 8,053 | 4,799
Foreign exchange contract |  |
Derivative assets: |  |
Derivative contracts |  | 1
Derivative liabilities: |  |
Commodity contracts | 4 | 1
Commodity contracts |  |
Derivative assets: |  |
Derivative contracts | 12,650 | 7,139
Derivative liabilities: |  |
Commodity contracts | 8,049 | 4,798
Cash and cash equivalents |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 17 | 33
U.S. government and federal agency obligations |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 106 | 112
Federal agency mortgage-backed securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 104 | 100
Commercial mortgage-backed securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 41 | 44
Corporate debt securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 116 | 122
Equity securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 471 | 494
Measured using net asset value practical expedient: |  |
Equity securities | 7 | 7
Foreign government fixed income securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 2 | 4
Equity securities — nuclear trust fund investments |  |
Measured using net asset value practical expedient: |  |
Equity securities | 92 | 99
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 | 15
Other trust fund investments (classified within other non-current assets): |  |
U.S. government and federal agency obligations | 1 | 1
Measured using net asset value practical expedient: |  |
Total assets | 3,122 | 1,635
Derivative liabilities: |  |
Commodity contracts | 1,173 | 626
Level 1 | Foreign exchange contract |  |
Derivative assets: |  |
Derivative contracts |  | 0
Derivative liabilities: |  |
Commodity contracts | 0 | 0
Level 1 | Commodity contracts |  |
Derivative assets: |  |
Derivative contracts | 2,528 | 981
Derivative liabilities: |  |
Commodity contracts | 1,173 | 626
Level 1 | Cash and cash equivalents |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 17 | 33
Level 1 | U.S. government and federal agency obligations |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 105 | 111
Level 1 | Federal agency mortgage-backed securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 1 | Commercial mortgage-backed securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 1 | Corporate debt securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 1 | Equity securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 471 | 494
Level 1 | Foreign government fixed income securities |  |
Nuclear trust fund investments: |  |
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) | 17 | 17
Other trust fund investments (classified within other non-current assets): |  |
U.S. government and federal agency obligations | 0 | 0
Measured using net asset value practical expedient: |  |
Total assets | 9,684 | 5,990
Derivative liabilities: |  |
Commodity contracts | 6,689 | 4,009
Level 2 | Foreign exchange contract |  |
Derivative assets: |  |
Derivative contracts |  | 1
Derivative liabilities: |  |
Commodity contracts | 4 | 1
Level 2 | Commodity contracts |  |
Derivative assets: |  |
Derivative contracts | 9,403 | 5,701
Derivative liabilities: |  |
Commodity contracts | 6,685 | 4,008
Level 2 | Cash and cash equivalents |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 2 | U.S. government and federal agency obligations |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 1 | 1
Level 2 | Federal agency mortgage-backed securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 104 | 100
Level 2 | Commercial mortgage-backed securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 41 | 44
Level 2 | Corporate debt securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 116 | 122
Level 2 | Equity securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 2 | Foreign government fixed income securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 2 | 4
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 | 0
Measured using net asset value practical expedient: |  |
Total assets | 719 | 457
Derivative liabilities: |  |
Commodity contracts | 191 | 164
Level 3 | Foreign exchange contract |  |
Derivative assets: |  |
Derivative contracts |  | 0
Derivative liabilities: |  |
Commodity contracts | 0 | 0
Level 3 | Commodity contracts |  |
Derivative assets: |  |
Derivative contracts | 719 | 457
Derivative liabilities: |  |
Commodity contracts | 191 | 164
Level 3 | Cash and cash equivalents |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 3 | U.S. government and federal agency obligations |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Federal agency mortgage-backed securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Commercial mortgage-backed securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Corporate debt securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Equity securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | 0 | 0
Level 3 | Foreign government fixed income securities |  |
Nuclear trust fund investments: |  |
Nuclear trust fund investments | $ 0 | $ 0

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