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Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | $ 1,197 | $ 1,922
Gross Amounts Offset in the Consolidated Statements of Financial Position | (791) | (1,489)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 406 | 433
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (1,172) | (2,169)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 863 | 1,512
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (309) | (657)
Natural gas |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 637 | 744
Gross Amounts Offset in the Consolidated Statements of Financial Position | (416) | (649)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 221 | 95
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (615) | (1,018)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 429 | 645
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (186) | (373)
Electricity |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 421 | 963
Gross Amounts Offset in the Consolidated Statements of Financial Position | (243) | (643)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 178 | 320
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (388) | (935)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 297 | 665
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (91) | (270)
Environmental & Other |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 139 | 213
Gross Amounts Offset in the Consolidated Statements of Financial Position | (132) | (196)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 7 | 17
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (150) | (214)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 137 | 201
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (13) | (13)
Interest rate contracts |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 0 | 1
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 | 1
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (16) | 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 | (16) | 0
Foreign currency exchange contracts |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 0 | 1
Gross Amounts Offset in the Consolidated Statements of Financial Position | 0 | (1)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 0 | 0
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (3) | (2)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 0 | 1
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | $ (3) | $ (1)

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