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Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | $ 891 | $ 1,197
Gross Amounts Offset in the Consolidated Statements of Financial Position | (643) | (791)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 248 | 406
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (935) | (1,172)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 690 | 863
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (245) | (309)
Natural gas |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 499 | 637
Gross Amounts Offset in the Consolidated Statements of Financial Position | (346) | (416)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 153 | 221
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (506) | (615)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 371 | 429
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (135) | (186)
Electricity |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 235 | 421
Gross Amounts Offset in the Consolidated Statements of Financial Position | (155) | (243)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 80 | 178
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (267) | (388)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 167 | 297
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (100) | (91)
Environmental & Other |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 146 | 139
Gross Amounts Offset in the Consolidated Statements of Financial Position | (142) | (132)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 4 | 7
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (161) | (150)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 152 | 137
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (9) | (13)
Interest rate contracts |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 10 | 0
Gross Amounts Offset in the Consolidated Statements of Financial Position | 0 | 0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 10 | 0
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | 0 | (16)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 0 | 0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 0 | (16)
Foreign currency exchange contracts |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 1 | 0
Gross Amounts Offset in the Consolidated Statements of Financial Position | 0 | 0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 1 | 0
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (1) | (3)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 0 | 0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | $ (1) | $ (3)

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