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Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | $ 1,922 | $ 1,391
Gross Amounts Offset in the Consolidated Statements of Financial Position | (1,489) | (1,120)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 433 | 271
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (2,169) | (1,508)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 1,512 | 1,078
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (657) | (430)
Natural gas |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 744 | 454
Gross Amounts Offset in the Consolidated Statements of Financial Position | (649) | (394)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 95 | 60
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (1,018) | (594)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 645 | 347
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (373) | (247)
Electricity |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 963 | 643
Gross Amounts Offset in the Consolidated Statements of Financial Position | (643) | (441)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 320 | 202
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (935) | (622)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 665 | 443
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (270) | (179)
Environmental & Other |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 213 | 294
Gross Amounts Offset in the Consolidated Statements of Financial Position | (196) | (285)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 17 | 9
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (214) | (288)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 201 | 288
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | (13) | 0
Interest rate 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
Foreign currency exchange contracts |  |
Derivative assets |  |
Gross Amounts of Recognized Assets (Liabilities) | 1 | 0
Gross Amounts Offset in the Consolidated Statements of Financial Position | (1) | 0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | 0 | 0
Derivative liabilities |  |
Gross Amounts of Recognized Assets (Liabilities) | (2) | (4)
Gross Amounts Offset in the Consolidated Statements of Financial Position | 1 | 0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position | $ (1) | $ (4)

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